The boys ________________ out and closed the doors quietly behind them.
A. stepped
B. crept
C. crawled
D. stumbled
查看答案
We must not _________ or we will be late for school.
A. loiter
B. swirl
C. blink
D. flare up
His __________ manner branded him a _______________ man.
A. brisk...competent
B. brisk...incompetent
C. queer...steady
D. sound...genuine
For thousands of years, we have looked up at the ___________ night sky and wondered if there were worlds like ours somewhere out there.
A. reddish
B. creaky
C. stellar
D. starry
They hope to _________________ the source of the infection.
A. maketracks
B. takedown
C. track down
D. keep track