--- Whose backpack is this?
--- It be Mary’s. She is looking for hers.
| A．can | B．must | C．may | D．can’t |
-What did you do in today's history class?
-We talked about the characters____ achieved fame in American history.
| A．who | B．which | C．／ | D．what |
-Why are you so late getting home?
-Our teacher didn’t let us go____ we had finished our homework.
| A．because | B．when | C．if | D．until |
-Why are there so many people in the restaurant?
-It starts business today and the drinks____ for free.
| A．were offered | B．have offered |
| C．are offered | D．will offer |
I____some information on the Internet for my trip in the coming winter holiday.
| A．gave up | B．looked up | C．showed up | D．ended up |
--Has Tommy finished his project yet?
--Maybe not. He ___on it at lunch time. Let's go to have a look now.
| A．has worked | B．is working |
| C．was working | D．had worked |