It is necessary to explain your theory _____, otherwise the audience won’t make sense of what you are trying to get across

Only when you get a special permit can youhave the ___ of interviewing the prime minister ofChina.

Can you guess if they____ to play basketball with us!—I think they’ll come if they _____free.

Thank you your help.—You are .

I’d like to go camping with you, but I have meeting _______.—If you don’t go, ______.