Sam spends two hours _______ his homework every day.
— __________ will the foreign students be back?—In about half an hour, I think.
—Excuse me. Could you wake me up when my friend ______here?—Of course. But we still don’t know when your friend ____ here.
—Do you know that there are many different ____ animals in the zoo?—Yes, I do. And I also know that some of them are _____ scaring.
It _______ that the worker didn’t eat anything.
Many families form close friendship _______ the students and stay _____ touch with them.