Cars play an important role in modern life , but they also cause many problems like air pollution.
| A．should | B．can | C．must | D．will |
相关试题
____ in the fields on a March afternoon, he could feel the warmth of spring.
| A．Walking | B．To walk | C．Walked | D．Having walked |
Only when I 
left my parents for America ____ how much I loved them.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
– I am afraid I can’t return the camera to you before Friday.
– ____.
| A．Not at all | B．Be  careful |
C．Take your time | D．Don’t be afraid |
1. shadeA. behave B. shadowC. considerate D. battle
2. crowdA. slowB. windowC. allowD. row
3. actorA. worth B. therefore C. exportD. doctor
4. reduceA. chemical B. regret C. generationD. intend
5. nutrition A. struggleB. supportC. summaryD. confuse
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