The flu is believed________by viruses that like to reproduce in the cells inside the human nose and throat.
| A．causing | B．being caused |
| C．to be caused | D．to have caused |
Be _____we can' t expect an absolute freedom of expression.
| A．confident | B．creative | C．grateful | D．reasonable |
Sometimes people just believe what they see, ______the reality may be different.
| A．as if | B．even though | C．since | D．unless |
- The speaker is a tall man with glasses.
- Then it_____ be Mr. Smith, who is short and thin.
| A．wouldn't | B．won't | C．mustn't | D．can't |
I have to see the doctor this afternoon because I ____ a lot lately.
| A．have been coughing | B．had coughed | C．coughed | D．cough |
- Why do you choose to work in a kindergarten?
- Well, you know, dancing is my _____. So it is my best choice.
| A．talent | B．ability | C．strength | D．skill |