Ability Advice Possibility Certainty

People ___________ worry more about global warming.

• should

• can't

• must

• may

Take your umbrella. It __________ rain today.

• should

• may

• can't

• must

You _____ be exhausted! You haven't taken a single break since you started this morning!

• can't

• must

• may

• should

You ____ have a lot of money. You have always put 30 percent of your salary in savings account since you started working 15 years ago.

• should

• may

• can't

• must

There is a small chance that we ____ go to the beach this weekend.

• should

• may

• can't

• must

Maggie ______ be sick. She's been jumping and playing in the playground all day!

• should

• may

• can't

• must

I think you ______ trust your parents more.

• can't

• should

• may

• must

They ____ be siblings. They look almost as if they were twins.

• should

• must

• may

• can't

It ________ be Ricky sitting over there. He moved to London 5 years ago and never came back.

• should

• must

• may

• can't

I _____ become a doctor when I grow up, but I doubt it.

• must

• may

• can't

• should