【推荐1】It is polite for students to put ________ their hands in class if they have questions.

【推荐1】Don’t argue with me. I’ll spend as much time as I can ________ (解释) it to you.

【推荐2】B. 根据句意和汉语提示，在空格中填入正确的词组（每空限填一词）．
1. Every year many people__________（受伤）or lose their life in traffic accidents．
2. They want to__________（听）music in their free time..
3. We usually go to the zoo__________（步行）．
4. You should__________（照顾） your little sister．
5. We must get to school__________（准时）．

【推荐3】For 30 years, 21st Century has ________ ________ ________ ________ (作贡献) China’s English education.

【推荐1】When the chairman _________ (finish) speaking, he ________ (leave) the hall.

【推荐3】Mr. Depp's plane l____but he wasn't on it. He may have missed the plane.