高浓度有机废水厌氧处理一般的PH值应严格控制在（）
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Rock: ______.Sharon: Very well, and the experiment is nearly finished.
A. How are you？
B. How is the experiment？
C. How are you getting on with the experiment？
D. What do you think of the experiment？
Maria: Do you think you will get a pay rise next year？Leo: ______.
A. I hope so.
B. I'm afraid so.
C. I believe not so.
D. I hope not so.
Roy: ______ It 's getting late.Ellen: Must you go soon？
A. Oh, it's already ten o'clock.
B. It's raining.
C. It's dark outside.
D. Shall I stay here a bit longer？
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