Barack Obama delivered a speech to 500 local youths during his visit to China, many of _______ were from Fudan University and Tongji University.
| A．them | B．whom | C．which | D．those |
—What did you say to your sister? I saw her crying in the room.
— It _________ my fault. I just said hello to her when I met her, nothing else.
| A．must have been | B．can’t have been |
| C．oughtn’t to be | D．should have been |
—What about ____ book?
—It’s too difficult ____ book for beginners.
| A．the; a | B．a; a | C．a; the | D．the; the |
Everyone in this country should work hard and do what they can _____ against national smog.
| A．fight | B．fought | C．fighting | D．to fight |
— Tom doesn’t seem so enthusiastic as he was two years ago.
— Yes. He’s really reached a point in his career ______ he has to decide what to do next.
| A．that | B．when | C．where | D．which |
We all breathed a sigh of relief when the news came _____ no one was injured in the accident.
| A．why | B．that | C．whether | D．which |