An _____crowd is awaiting the arrival of the film star.()
A. excited
B. exciting
C. excite
D. Excitedly
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The computer center, ____last year, is very popular among the students in this school.()
A. to open
B. opening
C. having opened
D. Opened
____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
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