________, JackcannevercatchupwithTominthestudyofEnglish. [ ]

We wondered __________ this afternoon.

Jim, have you done homework_________?—- Yes, I have _____ done it.

What do you think of Duan Linxi’s song ?—I think it’s ________best song in the world. Isn’t it _______ beautiful one?

The children in rural areas have few books to read. Let’s ______ some books to them.—Great, it is a good idea.