---Someone is knocking at the door. Who may it be?
---It ___________ be Tom. He is still in the school.
A. can’t B. mustn’t
C. couldn’t D. may not
Lucy had few close friends. So she didn’t know _________________ about the trouble.
A. who to talk B. who to talk to
C. who to say D. what to talk
His father knew little about the secret __________ I told him the other day .
A. when B. after C. until D. while
He climbed up the ladder __________ the wall and went into the room __________ the open window.
A. through； against B. against； through
C. against； against D. through； through
The boy refused ____________ so many strange questions.
A. to answer B. answering C. answer D. answered
---The couple _______ abroad recently. They’ll return home in 3 days.
---What great fun! But I _______ my hometown since I worked.
A. have been； have never left
B. have gone； have never left
C. have been； have been away from
D have gone； have been away from
