____from space, the earth, with water ____about seventy percent of its surface, looks like a blue ball. ()
A. Seen; covered
B. Seen; covering
C. Seeing; covering
D. Seeing; covered
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He is very old , _ he still works very hard .()
A. but
B. if
C. when
D. and
We had better hurry_____ it was getting dark.()
A. and
B. but
C. as
D. unless
Jane wore a raincoat _____ it was raining.()
A. so
B. but
C. however
D. because
-I don't like chicken____fish. -I don't like chicken,_____I like fish very much.()
A. and;and
B. and:but
C. or: and A
D. or; but
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