Is this your sister’s key, John?— No, it isn’t. ______ is in the bag.

Mr. Smith joined in different activities in Beijing. Do you know ___________?— Since 5 years ago.

He has read many books on history, so it’sfor him lo answer these questions.

Dad, why must I stop ______ computer games?—For your health, my boy.

We have to ____the sports meeting till next Friday because of the bad weather