Giúp mình với ạ!

II. Choose the correct modal verbs to complete the sentences.

1. Phong and Nick____ be in the same class, but I'm not sure.

A. can't

B. must

C. could

2. That____ be Jane in the shop. She's on holiday.

A. can't

B. mustn't

C. Could

3. You _____be right-you often are.

A. can't

B. Might

C.must

4.This ___be the best picture you've ever painted!

A. could

B. can

C. can't

5. This___ be the first time you've seen this film-it's been out for ages.

A. Could

B. mustn't

C. can't

6. The shop___ Saturdays? be closed by now, I'm not sure. What time do they close on

A. can't

B. could

C. Must