_____ from the moon, the earth with water _____ seventy percent of its surface.
A. See/covered
B. Seeing/covering
C. Seen/covering
D. To see/to cover
_____ to get there on time， we walked as fast as we could.
A. hoping
B. to hope
C. hoped
D. being hoped
When you called me this morning, I _____ the newspaper.
A. read
B. was reading
C. reads
D. have read
The reason _____ he failed the exam was _____ he had not worked hard.
A. why……if
B. why……that
C. that……why
D. why……what
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