Computer is so useful. It can do almost everything.—Yes, but it ______ what to do.

We had hoped to catch the 10：20 train, but _____ it was gone

I can’t see any orange in the glass. Please give me __________.

Ｉcould express my thanks to the traveler , he had already disappeared in the rain .

It is the theory ____the earth turns around the sun____ changes the world. [ ]