When the apples______ the tree are red ,you can always see many boys ______ the tree. [ ]

It is reported that the United States uses ______ energy as the whole of Europe.

Could you tell me ______ it takes to go from here to Beijing by air? – About 50 minutes.[ ]

Do you know ________?— I’m not sure. Maybe he is a businessman.

I have _______ much work to do _______ I have no time to go out with you.