--The man in a black suit _______ be our youth worker.
--- I’m sure it _______ be him. I saw him in the laboratory building some minutes ago.
| A．must; can’t | B．can; mustn’t | C．can; could | D．must; won’t |
They went to the park yesterday, ________?
| A．don't they | B．didn't they |
| C．aren't they | D．can't they |
She________ know the answer, but I'm not sure.
| A．maybe | B．may be | C．may | D．must |
Chinese________ by the largest number of people.
| A．is speaking | B．speak |
| C．speaks | D．is spoken |
Now China has joined WTO（世贸组织）, so I think English is________ useful than before.
| A．more | B．most | C．much | D．many |
The more careful you are, themistakes you’ll make.
A. more B. few C. fewer