The pyramid ________how many years ago，do you know?
| A．dated back to | B．dated from |
| C．dates back | D．dates back to |
____ 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. shade A. behave B. shadow C. considerate D. battle
2. crowd A. slow B. window C. allowD. row
3. actor A. worth B. therefore C. export D. doctor
4. reduce A. chemical B. regretC. generationD. intend
5. nutrition A. struggleB. support C. summaryD. confuse
Everyone, please remain ____ until the plane has come to a complete stop.
| A．seat | B．seated | C．seating | D．to seat |