3 . If it is possible, you’d better go to work by bike or by bus, which is beneficial to our environment. (同义句转换)
→________________, you’d better go to work by bike or by bus, which is beneficial to our environment.

4 . He was writing a poem when he ________________ (interrupt) by a knock at the door. (所给词的适当形式填空)

5 . This semester our school offers many optional courses to the students. Each of them appeals to many students. (同义句转换)
→This semester our school offers many optional courses to the students, ________ . (定语从句)

6 . The students, all of   ________ spent the whole day picking fruits, were extremely tired. (用适当的词填空)

8 . 我写信请你帮忙。（汉译英）
______________________________________________________________________________________________________

9 . While ________________ (ride) his bike home on a cold night, he came across a sad­looking elderly woman wandering the streets by herself. (所给词的适当形式填空)