Modal verbs: can-must-have to-should

1 You _______________ throw your rubbish in the bins.

• can

• must

• could

2 _____________ you please help me with the project?

• Should

• Must

• Could

3 You ______________ do extra exercises. We have already finished.

• can't

• mustn't

• don't have to

4 You ____________ smoke in this area. It's forbidden.

• mustn't

• don't have

• can't

5 You ____________ keep off the grass. (It's the rule.)

• should

• can

• must

6 You ____________ feed the animals in the zoo. It's forbidden.

• can't

• mustn't

• don't need to

7 You ______________ be careful with electricity. (I advise you to.)

• should

• have to

8 _______________ I close the window, please?

• Should

• Must

• Can

9 Our teacher says we ______________ study hard before the exam. (It's necessary.)

• must

• have to

• should

10 You ___________ come if you don't want to. (It isn't necessary.)

• can't

• shouldn't

• don't have to