After twenty-years abroad, William came back only _______ his hometown severely damaged in an earthquake.
A. finding
B. to have found
C. to be finding
D. to find
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You are just the same ________ you were the day when I first saw you.
A. that
B. as
C. like
D. to
_________ struck, a turning fork produces an almost pure tone, retaining its pitch over a long period of time.
A. When is it
B. One is
C. When it is
D. Is one
________ of the burden of ice, the balloon climbed up and drifted to the South.
A. to be free
B. Freed
C. Freeing
D. To free
The ________ of radio waves came to a halt all of a sudden.
A. transportation
B. transfer
C. transmission
D. translation