--- There were so many books in the shopping center, I didn't know_______ .
A. where to buy B. which to buy
C. how to buy D. what to buy
Put on your coat, Jack! It's snowing _______ outside at the moment.
A. hardly B. quickly
C. loudly D.heavily
—Is that Tom in the teachers' office?
--No, it ________ be him. He's gone to the hospital.
A. musn't B.shouldn't
C. can't D.needn't
Last night, Dan hung out with his friends too late. When he came home, he went upstairs without a _______. But to his surprise, his father was sitting in his room.
A. noise B. sound
C. voice D. silence
---Why didn't you go to the party last night?
---Because I was waiting for Sam in his office _______ he came back.
A.for B.until
C.since D.from
—Hey! Peter! What are you looking at?
---I find ________ hole in the blackboard, let's go and tell Mr. Wang about it.
A. a B. an C. the D.\
