9 . 用方框内单词或短语的适当形式选择填空

sign up for       be addicted to       be responsible for        focus on        other than destination       volunteer       company          exchange       schedule

1. It is not uncommon that students have busy ________ every day and do not get enough sleep.
2. Whether you visit only a couple of these ________ or all 28, your life will be enriched by the experiences.
3. She ________ a yoga course, which she thought she could take when she was free.
4. As you grow up, you should learn to respect and ________ yourself and for others.
5. The two women ________ looks and laughed.
6. We usually have our smartphones to keep us ________ at the table when eating.
7. If nobody else ________, then I will do it.
8. Earlier in the day, Mr. Biden, the former vice president, promised reporters that he would not “talk about anything ________ 9/11 terrorist attacks.”
9. You should stop complaining and start ________ how to improve it.
10. What do you think of those who ________ video games and forget their homework?