A

1. must, like

2. can't, be

3. can't, belongs

4. can't, live

5. must, has

6. must, remember

7. can't, want

8. must, spends

B

1. can't be, could be

2. can't be, could be

3. could be, can't be

4. can't be, must be

5. can't be, must be

6. must be

C

1. might go to Portugal

2. must cost a lot of money

3. might come this weekend

4. can't take much interest

5. must work long hours

6. must be at the gym, or he might also be at the shops