After a knock at the door, the children heard his mother’s voice him．

Hurry, Mike! The bus is coming. —Wait a moment, please! Let me see if there’s __________ left.

You should do the things worth ____, and if you have difficulty _____ them, you can turn to your family.

Don’t spend __________ time playing computer games . It’s bad for your eyes.

I’m sorry I can’t find the library book anywhere.— So…I’m afraid you have to _________ it.