【正文】 over such extended of work and pletion time ＋ the employer agrees to pay for the cost of work and the contractor agrees to accept the cost of work done for a total cost of______________on the basis of unit cost of the work specified in the bill of quantities or such other sums as may be ascertained under the conditions of the contract.the contract shall be pleted by5assignment and sub lettingthe contractor shall not assign the contract or any partthereof， or any benefit or interest therein or thereunder without the prior written consent of the employer.the contractor shall not sublet the whole of works. except where otherwise provided by the contract， the contractor shall not sublet any part of the works without the prior written consent of the employer. such consent， if given， shall not relieve the contractor from any liability or obligation under the contractand he shall be responsible for the defaults and neglects of any subcontractor， his agents or the drawings shall remain in the sole custody of the employer， but two copies thereof shall be furnished to the contractor free of contractor shall provide and make at hisown expense any further copies required by him. at the pletion of the contract， the contractor shall return to the employer all drawings provided under the contract.one copy of the drawings， furnished to the contractor as aforesaid， shall be kept by the contractor on the site and the same shall at any reasonable time be available for inspection and used by the employer and by any other person authorized by the employer in writing.the contractor shall give written notice to the employer whenever planning or progress of the works is likely to be delayed or disrupted unless any further drawing or order， including a direction， instruction or approval， is issued by the employerwithin a reasonable notice shall include details of thedrawing or order required and of why and by when it is required and of any delay or disruption likely to be suffered if it is late.if， by reason of any failure or inability of the employer to is sue within a time reasonable in all the circumstances any drawing or order requested by the contractor in accordance with sub（3） of this clause， the contractor suffers delay， then theemployer shall take such delay into account in determining anyextension of time to which the contractor is obligationsthe contractor shall take full responsibility for the adequacy， stability and safety of all site operations and methods of construction， provided that the contractor shall not be responsible， except as may be expressly provided in the contract， for the design or specification of the permanent works ， or for the design orspecification of any temporary works.the employer shall have made available to the contractor with the tender documents such data on hydrological and subsurface conditions as shall have been obtained by or on behalf of the employer from investigations undertaken relevant to theworks and the tender shall be deemed to have been based on such data， but the contractor shall be responsible for his own interpretation thereof.the contractor shall also be deemed to have inspected and examined the site and its surroundings and information availablein connection therewith and to have satisfied himself， so far as ispracticable， before submitting his tender as to the form and nature thereof， including the subsurface conditions， the hydrological and climatic conditions， the extent and nature of work and materials necessary for the pletion of the works， the means of ac cess to the site and39。the acmodation he may require， in general， shall be deemed to have obtained all necessary information， subject as above mentioned， as to risks， contingencies and all other circumstances which may influence or affect his tender.the contractor shall be deemed to have satisfied himself be fore tendering as to the correctness and sufficiency of this tenderfor the works and of the rates and prices stated in the priced bill of quantities and the schedule of rates and prices， if any， whichtender rates and prices shall， except insofar as it is otherwiseprovided in the contract， cover all his obligations under the contract and all matters and things necessary for the proper execution and maintenance of the works.save insofar as it is legally or physically impossible ，the contractor shall execute and maintain the works in strict accordancewith the contract to the satisfaction of the employer and shall ply with and adhere strictly to the employer39。s instructions and directions on any matter whether mentioned in the contract or not， or concerning the works.the contractor shall give or provide all necessary superintendence during the execution of the works and as long thereafter as the employer may consider necessary for the proper ful filling of the contractor39。s obligations under the contract， the contractor，or a petent and authorized agent or representative approved of in writing by the employer， which approval may at any time be withdrawn， is to be constantly on the works and shall give his whole time to the superintendence of the same. if such approval shall be withdrawn by the employer， the contractor shall， as soon as is practicable， having regard to the requirement of replacing him as hereinafter mentioned， after receiving notice of such withdrawal， remove the agent from the works and shall not thereafter employ him again on the works in any capacity and shall replace him by another agent approved by the employer. such authorized agent or representative shall receive， on behalf of the contractor， directions and instructions from theemployer.（1） the contractor shall provide and employ on the site inconnection with the execution and maintenance of the works：（a）only such technical assistance as are skilled and experienced in their respective callings and such subagents， foremen and leading hands as are petent to give proper supervision to