4. (单词) v. 出席；参加
5. （单词）n. 储备；储藏；v.预定
6. (短语) 注意；
8. (单词) adv. 否则；不然
9. — The talent show Youth With You (⻘春有你) is becoming hotter and hotter online.
— Exactly. Half of our class ________interested in it recently.
A. is B. are C. was
10. — Look! Mr. Green is at the end of the street.
— No. It ______be him. He has gone to England.
A. mustn't B. won't C. shouldn't D. can't
11. — Who will give us the speech on public manners?
— Mr. Brown________ , but I'm not sure.
A. can B. need C. must D. might