form the moon, our earth with water        .seventy percent of its surface, appears as a blue ball.
#92376
A
seen, covered
B
seeing, covering
C
seen, covering
D
seeing, covered
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No matter how bright a talker you are, there are times when it’s better     silent.
#91718
A
remain
B
to remain
C
having remained
D
to be remained
More and more carbon dioxide is being released into the air,________the more severe global warming effects.
#89528
A
contributed to
B
to contribute to
C
contributing to
D
to be contributed to
Tom took a taxi to the airport, only _______ his plane high up in the sky.
#90313
A
finding
B
to find
C
being found
D
to have found