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(单选题)Look at the sign over there. No smoking. You should ______ y (单选题)—Tony is talking with our English teacher over there, isn’t (单选题)—Could you please help me carry the box?—______. (单选题)The students are studying hard, for they know ______. (单选题)______ of the money ______ spent recycling the rubbish. (单选题)The girl looked at the man angrily ______ was talking loudly (单选题)______ book on the desk is ______ useful one. (单选题)We can ask him when he ______. (单选题)Please wait for me ______ the corner ______ three o’clock. (单选题)The factory was built in a secret place, around ______ high