At first 1 thought I understood what she said, hut the more I thought about it, ______.
A. the more did I become confused
B. the more 1 became confused
C. the more confused became I
D. the more confused I became
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I know it's not important but I can't help______about it.
A. to think
B. thinking
C. thinks
D. think
You had better______ my telephone number before you forget it.
A. write down
B. clear out
C. put aside
D. skim over
Brass (黄铜) is______ gold in color.
A. similar with
B. familiar with
C. familiar to
D. similar to
Solid-fuel engines are simpler than liquid-fuel engines, ______have important uses.
A. both of them
B. both
C. both of which
D. both all
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