．________ useful book is helpful to ________ artist.
| A．An, an | B．A, a | C．A; an | D．An; a |
____ 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
Out ________， still discussing the fashion show with great interest.
| A．walked a crowd of young girls | B．did a crowd of young girls walk |
| C．were walking a crowd of young girls | D．a crowd of young girls were walking |