Many kinds of birds fly south at the ______ of winter.
| A．sight | B．approach | C．direction | D．access |
With the fast development of computer and Internet technologies, traditional printed books ______ by the growing popularity of online reading of e-books.
| A．are challenged | B．have challenged |
| C．are being challenged | D．have been challenged |
In many people’s opinion, that company, though relatively small, is pleasant ______.
| A．dealt with | B．dealing with | C．to be dealt with | D．to deal with |
The computer system _____suddenly while he was surfing the Internet.
| A．broke up | B．broke out | C．broke in | D．broke down |
It is usually warm in my hometown in March, but it _____ be rather cold sometime.
| A．must | B．can | C．should | D．would |
—What about going dancing this evening, Tom?
—_____. I have a test tomorrow, so I have to go over my lessons tonight.
A I’d rather not B. I’ll take it
C. I don’t think so D. I’d like to