用反馈归零法实现任意进制计数器必须采用二进制计数器芯片，而不能采用十进制计数器芯片。
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1. There was a terrible noise ____ the sudden burst of light.
A. followed
B. following
C. to be followed
D. being followed
2. The Olympic Games, ____ in 776 B. C., didn't include women until 1912.
A. first playing
B. to be first played
C. first played
D. to be playing
3. What's the language ____ in Germany?
A. speaking
B. spoken
C. be spoken
D. to speak
4. Most of the people ____ to the party were famous scientists.
A. invited
B. to invite
C. being invited
D. inviting
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