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Class is over。 The students are jumping with joy， just like runaway horses。 Look， some of them have left their seats and begin to play noisily。 They are laughing and screaming from time to time。 Some don't leave their seats。 They are making use of the short time to play games。
Sometimes they argue so seriously and sometimes they appear so polite。 Others are sitting in their seats， as if they are thinking of something。 Now and then they will stop to watch what others are doing。 What an active ten minutes' break it is!