----- Nội dung ảnh -----
1. It's wet and windy outside today. You __________ go out without an umbrella.
A. must B. should C. don't have to D. shouldn't

2. __________ anybody attend the lecture or is it just for registered students?
A. Must B. Can C. Have to D. Should

3. Lindsay watched the movie in Spanish and __________ understand very much of it.
A. didn't have to B. can't C. couldn't D. may not

4. Students in many schools __________ have chewing gum. It is against the rules.
A. mustn't B. shouldn't C. might not D. don't have to

5. That sign means we __________ enter the room. It’s for the crew members only.
A. won’t B. mustn’t C. have to D. don’t have to

6. I’m having trouble keeping up with the rest of the class. What __________ I do?
A. may B. couldn’t C. might not D. should

7. When he was young, he __________ swim very well. He won medals and championships!
A. could B. must C. has to D. must

8. The students __________ answer Ms. Evens’ questions. Those questions are very challenging.
A. can not B. can't C. could D. couldn't

So sánh của tính từ và trạng từ (Comparisons of Adjectives and Adverbs)