（）in space， the satellite sent us a great deal of information.
A. Having travelled
B. Travelled
C. Travelling
D. Being travelled
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() the right address, we found her house easily.
A. Given
B. Having given
C. Giving
D. Give
If he () the problem well, he couldn't have solved it.
A. has not studied
B. shouldn't have studied
C. had not studied
D. were not to study
Can machine perform the same tasks () ?
A. that man does
B. what man does
C. which man does
D. as man does
I can't help () about what he said once again.
A. thinking
B. thought
C. to think
D. have thought
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