If all business goes paperless, at least one million tons of paper will be a year．
| A．used | B．saved |
| C．copied | D．offered |
—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．\ |
–Do you know _______?
---I’ve got no news. Maybe next year?
| A．where Liu Xiang can train himself better |
| B．if Liu Xiang has got much better |
| C．how Liu Xiang will take part in big games |
| D．when Liu Xiang will return to the game field |