单项选择题

It's ten years since the scientist ______ on his life's work of discovering the valuable chemical.

A. made for
B. set out
C. took off
D. turned up
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单项选择题
I'd like to buy a house — modern, comfortable, and ______ in a quiet neighborhood.
A. in all
B. above all
C. after all
D. at all
单项选择题
— Do you think I should get a good guidebook — Yes, of course. ______, you also need a good camera and comfortable shoes.
A. What's more
B. In other words
C. By the way
D. All in all
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