【正文】
. Knives ______ ______ for cutting things. students clean the windows of their classroom twice a month. The windows of their classroom______ _______ twice a month. are used are cleaned (變被動(dòng)語(yǔ)態(tài)) found the ticket on the floor. ______ ______ ______ ______ on the floor. told her to return the book in time. She ______ _______ to return the book in time. The ticket was found was told 5. Last year we built a library in our school. A library _______ _______ in our school last year. people can use puters to help them. Now puters _______ ______ ______ to help them. was built can be used 7. Did you plant many trees at this time last year? _______ ______ _______ _______ at this time last time? we finish our work today? _______ o