When______, I will talk to him.
A. does Peter come
B. Peter will come
C. Peter comes
D. can Peter come
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My sister______to see me . She will be here soon.
A. comes
B. is coming
C. had come
D. came
They said they______our answer the next day .
A. had heard
B. would hear of
C. would hear
D. will hear
The old man said that light______faster than sound.
A. went
B. will go
C. travels
D. will travel
信号频率覆盖500Hz~50kHz，应选用______滤波器。
A. 带通
B. 高通
C. 低通
D. 带阻
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