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.32 They began by experimenting ______ rats.33 Please concentrate ______ what you are doing.34 She prides herself ______ her clean house.35 The climber failed ______ his attempt to reach the summit.36 Many people escaped ______ prisons during the last five years.37 We must economize ______ fuel.38 He39。s never done any work. He lives ______ his mother.39 He was employed ______ a factory before he joined the army.40 And what does this horrible drink consist ______ ?41 I shall certainly act ______ your advice.42 Don39。t write ______ the desk!43 You should not boast ______ your success.44 You must encourage him ______ his efforts.45 He should be instructed ______ his duties.46 Two or three people were involved ______ the accident.47 Children should be prohibited ______ smoking.48 I can assure you ______ my support.49 Do you approve ______ hunting?50 I despair ______ ever teaching him anything!51 Has this play ever been performed ______ the stage?52 I warned him ______ the danger, but he wouldn39。t listen to me.53 How much have you borrowed ______ me already?54 He delights ______ annoying me.【Multiple choice questions】多項(xiàng)選擇題1 Jane never dreamed ______ a letter.a. to receive b. to receiving receive she would receive8 We were travelling across the Channel. We went on a ______ across the Channel. go on a trip 進(jìn)行旅行9 Jane wrote her name and address on a ______ of paper. 10 Both girls often write to each other now. They write ______ . and again7 The girls write ______ regularly now. one another one to the other to other other