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31.Its time for/to do sth. 春天到了，该种树了。 Spring has come, its time to plant trees. 是我们听英语节目的时间了 Its time for us to listen to English programme. 该上学了。 Its time to go to school./ Its time for school. 32.Its two meters (years) long (high, old). 这个游泳池长50m,宽20m，深2.5m。 The swimming pool is 50 metros long, 20 meters wide, two and a half meters deep. 河里的冰有几百米厚。 The ice in the river is several hundred thick. 中国的历史有几千年那么久远。 For Chinese history, its about thousands of years. 33.keep sb. doing 很抱歉让你在这儿等这么长时间。 Im sorry to keep you waiting for such a long time. 那个军官让士兵们在太阳下站一个小时。 The officer kept the soldiers standing in the sun for an hour. 34.keep/make sth. +adj. 在图书馆请保持安静。 Please keep the library quiet. 这条消息使他们很难过 This piece of news made them very sad. | 
