______ people are standing outside the office. _____ people there is at least over 1,000.
| A．A number of; A number of | B．The number of; The number of |
| C．A number of; The number of | D．The number of; A number of |
.---Let's go to the seaside for fresh air,OK?
---_______.
| A．Not at all. | B．Why not? | C．Never mind. | D．What of it? |
.Many parents think it will be of great use for their children to ______ from home and earn their own living.
| A．run away | B．take away | C．keep away | D．get away |
Color - blind people often find it difficult to ______ between red and green.
| A．distinguish | B．compare | C．contrast | D．distribute |
Those two countries are similar ______ they both have heavy snowfalls during the winter.
| A．to which | B．in that | C．so that | D．except that |
It ______ long befor the Chinese Space Center ______ Shenzhou VII Spacecraft,becoming the third country to send an astronaut to "walk" in space after the United States and the former Soviet Union (now Russia).
| A．will not be,launches | B．was not,launched | C．will be,launches | D．was not,had launched |