Our class discussed the question of __________it is necessary for us students to use mobile phones on campus.

Our class discussed the question of __________it is necessary for us students to use mobile phones on campus.

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where

whether

that

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 I won’t call you, ________ something unexpected happens.

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unless

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because

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—How long do you think it will be___ the Stock Market returns to normal?—At least one year, I guess.

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 I hope you don’t mind me asking, ____ where did you buy these books?

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but

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_By success I don’t mean_______usually thought of when that word is used.

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—- Can you tell me how to improve my spoken Enlish ? —- Do more speaking ,I think ,______ you will do better in it .

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