Without the air to hold some of the sun’s heat, the earth at night ____ for us to live.
All that can be eaten _______ eaten up.
—When will you come to see me, Dad? —I will go to see you when you _______ the training course.
—How long _______ at this job? —Since 1990.
—Have you been wasting time on films again?—_____. I’ve been working and I need a break.
—English has a large vocabulary, hasn’t it? —Yes. _____ more words and expressions and you will find it easier to read and communicate.