Don't promise anything _____ you are one hundred percent su..

Don't promise anything _____ you are one hundred percent sure.A. whetherB. afterC. how D. unless

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(2013·四川省都江堰市二模)—Mike, I can't find my watch anywh..

(2013·四川省都江堰市二模)—Mike, I can't find my watch anywhere.—You ________ it while working out.A.may have lost B.could have lostC.would have lost D.should have lost

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He stood up, _____the large door and looked outside. There ..

He stood up, _____the large door and looked outside. There on the ground lay a white dog. [ ]A. opens B. opened C. opening D. having opened

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— Why did he come back?— It is ______ he forgot to take his..

— Why did he come back?— It is ______ he forgot to take his umbrella with him.A. for B. as C. since D. because

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—Is Jack on duty today? —It_____ be him. It’s his turn t..

—Is Jack on duty today? —It_____ be him. It’s his turn tomorrow.A.mustn’tB.won’t C.can’tD.needn’t

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