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26. We _______ talk loudly when we see the sign “Be quiet” on the wall.
A. must B. mustn’t C. need D. needn’t
27. Why not________ your teacher for help when you can’t finish ________it by yourself?
A. ask, write B. to ask, writing C. ask, writing D. asking, write
26. We _______ talk loudly when we see the sign “Be quiet” on the wall.
A. must B. mustn’t C. need D. needn’t
27. Why not________ your teacher for help when you can’t finish ________it by yourself?
A. ask, write B. to ask, writing C. ask, writing D. asking, write