Only when you realize that how valuable water is________ it.
A. you can save
B. can you save
C. that you can save
D. that can you save
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So________ that he can't run fast.
A. fat is he
B. fat he is
C. fat does he
D. fat he does
In the old house _________ 10 years ago.
A. an old lady live
B. had old lady lived
C. lived an old lady
D. have old lady lived
_____ a good teacher, I would study hard in the university.
A. Should I to become
B. Were I to become
C. I should become
D. Had I become
由定差减压阀和节流阀串联而成的组合阀是（ ）
A. 温度补偿调速阀
B. 溢流节流阀
C. 调速阀
D. 普通节流阀
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