Scientists have done a lot of study to show that praise is far __ (effective) than criticism in improving students' behavior.
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This is exactly what I want to show: never desert a friend in his hour of need.
B)我确切的想要表明的是：永远不会在朋友需要我时离开他。
c)我认为正确的表达是，决不要在朋友需要你的那一个小时离开他。
D)这正是我所想要表达的意思：不要在朋友困难的时候离开他。
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（）咨询委员会（）全会
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Miss Liu, I am writing to inform. you that I wish to move into a new room next term. The reason for my dissatisfaction with my roommate is his inconsiderate behavior. His friends constantly visit him and he regularly holds noisy parties. In addition, he sometimes uses my things without asking me. Under these circumstances, I find it difficult to concentrate on my studies. I would be grateful if you could find another room for me.
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Donna is feeling very cold and sneezing(打喷嚏)a lot. She seems (catch) ____ a cold.
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How many hours of operation are there every day？
__________.