— Do you know whose magazine is it?— I think it         be Lily’s, for we can find her name on the cover.

He _______ have taken your car by mistake because he didn’t have the keys.

We _______the letter yesterday, but it didn”t arrive.

 — _________ I use your telephone?— Yes, of course.

It is hard to say what kind of person he is．Sometimes he is very friendly; at other times he ___ be very cold．