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.
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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？
Mario: Your beloved teacher has arrived here, Nina.Nina: I______ she ______ until tomorrow.
A. think; isn't coming
B. thought; wasn't coming
C. didn't think; was coming
D. didn't think; is coming
测定高锰酸盐指数时，什么当水样中的Clˉ含量比较高时，反应介质为碱性？当水样中Clˉ含量比较低时，反应介质为酸性？
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