Must vs could

Choose the correct answer:

We _________ fasten our seatbelts.

• must

• could

Choose the correct answer:

Mum: You __________ stop playing computer games.

• must

• could

Choose the correct answer:

She _________ learn to drive. It will be very useful.

• must

• could

Choose the correct answer:

Banks __________ examine all documents.

• must

• could

Choose the correct answer:

I __________ get some sleep.

• must

• could

Choose the correct answer:

A: I didn't have breakfast and it's 5.00 pm already.

B: You __________ be starving.

• must

• could

Choose the correct answer:

She _________ tell the truth to the court.

• must

• could

Choose the correct answer:

You ___________ answer at least one question.

• must

• could

Choose the correct answer:

I __________ return the book now.

• must

• could

Choose the correct answer:

You __________ do the exercises, they are obligatory.

• must

• could