1 . The learning experience can be________ (reward) and practical. (所给词的适当形式填空）

3 . Sometimes doing voluntary work can be tiring but r_________ (worth doing).(根据首字母单词拼写)

4 . 根据句意用所给单词或短语的正确形式填空

put...at risk          not to mention          make a joint effort          have an influence on....       other than for good             lose one's temper       at a great cost               persuade sb. to （do...）（be）engaged in （be）equipped with        in vain        have advantages over          bring forth       appropriate       rewarding

1. You must think all the details over before taking action, or the safety of people will___________.
2. The injury is so serious that it might keep him out of football___________.
3. Sorry, I don't think this is a（n）___________ time to mention the subject of money.
4. I know the job I'm doing is___________and is worth all my efforts.
5. They were given nothing___________dry bread and water for their evening meal.
6. People across the country are___________to help those affected by the natural disaster.
7. ___________skills and knowledge, the graduates from our school feel confident about their future.
8. Pollution has a negative effect on people's health,___________ the damage to the environment.
9. You will not be able to convince others unless you___________your evidence.
10. His efforts were not___________； his son has become a useful person.
11. Before we carried out the detox, over 100 students___________stop using social media.
12. He finally achieved what he set out to do, but___________.
13. We went into the room and found him___________a very violent argument with his partner.
14. The reform and opening-up policy___________Chinese society since it was implemented.
15. The man apologized to his wife for___________at the party, promising he'd never do that again.