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

What you said just now me of that American professor.

－Could I have a look at your new bicycle－Sorry, I _______ it to Alice. She _____ to borrow it this morning.

If you had told me in advance, I ___ him at theairport.

Tom likes cars. He enjoys _______ model cars of all kinds.