I won’t leave here until my mother _______ back.
A. will come B. is coming C. came D. comes
We really don’t know _______. Could you help us?
A. how to do B. what to do
C. to do what D. to do how
—Will you please ________ do that? —OK, I won’t.
A. won’t B. not C. don’t D. can’t
We had fun ________ the robots do many different kinds of things.
A. to watch B. watched C. watching D. watches
The boss makes the workers ________ long hours every day.
A. work B. to work C. works D. working
—________ will you come back from your work, Dad?
—In about half an hour, dear.
A. How long B. How often
C. What time D. How soon
