We recently did a simple experiment, which happens to ________ how children's knowledge of what a hero is like determines their behaviour.
| A．congratulate | B．acknowledge |
| C．distinguish | D．illustrate |
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. regret C. generationD. intend
5. nutrition A. struggle B. support C. summaryD. confuse
Some people create jobs, foster(滋生）excitement and basically make the system work. They see possibilities ______ others see only problems.
| A．that | B．what | C．which | D．where |
. You can’t complain of being lonely you don’t make any effort to meet people．
| A．until | B．when | C．once | D．though |