______ it is true that a student's most important goal is to do well in his or her studies, it doesn't need to be the only goal.
| A．When | B．As |
| C．While | D．Before |
Great changes ___ in our city since 1977.
| A．take place | B．have taken place | C．took place | D．are taken place |
The fact has worried many scientists ______ the earth is getting warmer and warmer these years.
| A．what | B．which | C．that | D．though |
—How about your journey to Mount Emei?
—Everything was wonderful except that our car _________ twice on the way.
| A．slowed down | B．broke down | C．got down | D．put down |
—Do you mind my opening the window? It’s a bit hot in here.
—, as a matter of fact.
| A．Go ahead | B．Yes, my pleasure | C．Yes, I do | D．Come on |
The traffic is heavy these days, I arrive a bit late, so could you save me a place?
| A．can | B．must | C．need. | D．might |