I think _______ a foreign language is not easy. You should _______ it often.

It’s many years since I saw you last, I _____ you at all.—I wouldn’t have, either, if someone _____ you by the name.[ ]

_____, the population of China is the largest in the world.

John was very upset because he was _____ by the police with breaking the law.

Why not ______ your teacher for advice when you don’t know ______ the problems