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重点讲解：
1.ask sb to do 要求某人做某事
例句：You must feel free to ask them to repeat the question if you fail to understand. Be confident and smile.
你如果有问题没听明白，可以随意的请他们重复。
2.make better use of 更好的利用
例句：What she suggested was that the clinic should make better use of those herbs.
她建议医疗站更好地利用那些草药。
3.choose to do 选择做某事
例句：If you choose to do this, however, please make sure the yogurt you buy specifically contains lactobacillus acidophilus, as many do not.
如果您选择这样做，不过，请确保你购买专门的酸奶含有嗜酸乳杆菌，因为许多没有。
4.whether or not 是否
例句：Whether or not he apologizes is beside the point. He shouldn't hit his wife.
他有没有道歉并不重要。总之他不该打老婆。
