A. In the classroom. B. In the hallways. C. In the dining hall.

【题目】I didn't hear the phone. I ______ asleep.
A.must be
B.must have been
C.should be
D.should have been

【题目】Please ______ the light. It's getting dark.
A.switch on
B.switch off
C.turn off
D.turn down

【题目】-- Someone is knocking at the door.
-- Who ______ it be at this hour of day?
A.may
B.can
C.must
D.should

—He promised ________ me a new bike.

A. buy B. bought C. buying D. to buy

【题目】I enjoy _______ my school friends.
A.see
B.to see
C.seeing
D.saw

【题目】It is cold in the room. They ______ have turned off the heating.
A.must
B.ought to
C.should
D.could

【题目】Cindy is from America, but she can __________ Chinese.
A.find
B.join
C.speak

A. think of B. try out C. find out D. make sure

A. three five B. three fifths C. third fifth D. three fifth