A sudden change in temperature _______ to bring rain or snow.
| A．gets | B．turns | C．hopes | D．tends |
--- What are you going to do tomorrow ?
----How about going to buy Michael Jackson CDs?
----- ______________
| A．Take your time . | B．Not at all |
| C．Sounds great | D．It doesn’t matter. |
The old man would appreciate _____ if you could do him that favour.
| A．one | B．it | C．that | D．this |
It is reported that this kind of vegetables _ a lot of vitamins C.
A. contains B. includes C. holds D. keeps
______ time went by , Herbert could finish all the maths exercises in class.
| A．With | B．As | C．while | D．Since |
Lots of the scientists in our country are working hard to ____the planet Mars .
| A．cover | B．search | C．discover | D． explore |