---What’s wrong with you, Eric? You look tired.---I ________ to prepare for the final exam last night.
I think ____necessary for us _____the birds.
Birds can find food _____ now than before.
Children couldn’t wait _____ the gift box ____ the morning of Christmas Day.
We need ________ at the hotel for a few days because of the heavy snow.
Dennis doesn’t paint others, but his ideas are the most wonderful of all.