Sometimes smiles around the world ________ be false, hiding other feelings like anger, fear or worry.

It ________ have been her to leave her child alone and do whatever she wanted. She isn't such a person.

The magazine        be Lily’s, for we can find her name on the cover.

—Must I pay for the bill now, boss?—No, you __________ pay for it after the meal.

We _______the letter yesterday, but it didn”t arrive.