6.accurate， correct， exact， precise
accurate准确的，精确的。如：Clocks in railway stations should be accurate.(火车站的钟应该是准确的。)
correct“正确的”，指符合一定的标准或准则，含有“无错误的”意味。它的反义词是
incorrect， wrong.exact“精确的”，“恰好的”，比“大体上正确”更进一步，表“丝毫不差”。
它的反义词是inexact.precise强调“精确”，“精密”。
7.accuse， charge， sue
accuse 指责，指控，常与of 搭配。如：His boss accused him of carelessness.
charge 常与with搭配。如：The police charged the driver with reckless driving.
sue 常与for 搭配。如：Smith sued his neighbor for damaging his house.
8.achieve， acquire， require， inquire
achieve(成功地)完成，实现。如：He will never achieve anything unless he
works harder. (如他不努力工作，将会一事无成。)
acquire取得，获得，学到。如：acquire knowledge (获得知识)
inquire打听，询问。如：inquire a person‘s name(问一个人的姓名)
require需要。如：We require more help. (我们需要更多的帮助。)
