Mark is a very good swimmer. He __________ swim 10 kilometres in 2 hours!

• can

• could

• should

Babies ____________ read comic books.

• shouldn't

• can't

• might

People __________ fasten seat belts when travelling by car.

• should

• can

• must

You often have headaches. I think you ___________ visit a neurologist.

• can

• should

• may

Paul___________ be at home; he always works until 9 p.m.

• can

• can't

• mustn't

My sister ___________ come back from London tonight, but I’m not sure.

• ought to

• must

• may

Most children ___________wear school uniforms in private schools.

• can

• must

• might

My son has always been a clever boy; he ___________ read when he was three.

• could

• might

• may

You __________ smoke. It’s a really bad habit!

• shouldn't

• mustn't

• can't

Dad is taking a nap; you ___________make so much noise, children.

• needn't

• might not

• mustn't