—Shall we go out for a walk? —Sorry. This is not the right _________ to invite me. I am too tired to walk.
She got up ________ late that she missed the first two classes.
There are two buildings, ________ stands nearly a hundred feet high.
Some new oilfields ________ since 1976.
She’s having a lot of trouble with the new computer, but she doesn’t know whom to ________.
________ you’ve heard the song, you’ll never forget it.