—I bought three DVD copies of the film Avatar and now is left. Somebody just borrows something and never returns.—Things like that happen all the time.
With a lot of difficult problems____________, the manager felt worried all the time.
--Was Tom there when you arrived? --Yes, but he___________ home soon afterwards.
—Look at these tracks. It __________ be a wolf.—It needn't be. It ___________ be a fox.
Travelers_______________ that they should bring their ID cards with them.
—Our holiday cost a lot of money. —Did it? Well, that doesn't matter____________ you enjoyed yourselves.