Once out of the earth’s gravity, the astronaut is____by the problem of weightlessness.

What a fine day! The sunshine is looking ______the window.

I don’t know _________ the problem.

Excuse me, can you tell me how to get to the park–Sorry, I have been here for the first time.–_________.

_______ at a table, left-handers need to movethe water glasses put on the right side to their more convenient left side