Modal verbs for obligation

I ____________call my mum. it's her birthday

• have to

• must

I'm lucky because I ________________ wake up early in the morning

• don't have to

• shouldn't

I think you _____________ study harder. your exam results weren't very good

• Should

• Shouldn't

You ___________ be afraid of taking risks, or you will never live your dreams

• musn't

• Should

You ____________ waste so much time on the computer. You'll never finish your homework

• shouldn't

• don't have to

I really _____________ do more exercise. I'm so unfit

• musn't

• must

I understand the situation perfectly. You ___________ explain further

• Mustn't

• don't have to

• have to

• should

Write "OK" if the sentence is correct, if not, correct it

I must remember to call Sarah tomorrow

(a)  

Write "OK" if the sentence is correct, if not, correct it

Tom isn’t going out this evening. He must study

for his exam.

(a)  

Write "OK" if the sentence is correct, if not, correct it

Richard mustn't wear a suit to work, but he usually does

(a)