I usually sleep with the window open _____ it’s very cold.
A. until B. unless C. when D. if
We have to _________our school trip till next week because of the heavy rain.
A. put off B. put on C. put up D. put down
The light is on in Mr. Green’s room. He _______ be at home.
A. must B. can C. mustn’t D. can’t
A new supermarket in my hometown last month.
A．built B．has built C．was built D．is building
—Excuse me. Could you tell me ______________ get to the airport?
—Certainly. Go straight along here.
A. how can we B. how we can C. when can we D. when we can
Friends are those__________ make you smile，always open their hearts to you and encourage you to succeed
A. which B. what C. whom D. who
