We should give a hand to the people ________ need help.

Where are the books?—_______ in the bookcase. Do you need _______ now?

In his lecture, the professor referred to the belief, in contrast to all other countries, ______the elderly are wise, ______is particularly dominant in the Chinese culture．

Teenagers _______ allowed to drive in the street ．

Can I tell Peter about the news?—No, I don’t want anyone else to know it. You _______keep it to yourself.