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          【題目】Boys and girls, ________ learning and have fun!
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          【題目】—Judy, did you take your ________?
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          【題目】— Do you usually get up early? 
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          A.on; onB.at; atC.on; at
          

			
          

			
          
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          【題目】The students in this school plant ________ trees every year.
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          【題目】Mom won’t let Dick go out ________ he promises to be back by 10:00 tonight.
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          【題目】— ________of them knows the answer. What can we do now?
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          【題目】— A friend should be someone you can ________ in difficult time.
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          【題目】If you say his opinion is very ________, it's very useful and you will follow it.
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