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He's good at Maths.It's easy for him to work out such a Math

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He's good at Maths.It's easy for him to work out such a Maths p________
1.______water here is dirty.How can we clean it?
A.A B.An C.The D./
2.The children are______to play in the water
A.excited B.exciting C.excitedly D.excite
3.We take part in_____ word quiz,or have fun learning world history
A.a B.an C.the D./
a maths problem.这个就不用解释了吧,不明白没关系,与其等着记忆大段的解释不如就记住maths problem这个搭配就完事儿了.
the water here is dirty.here强调是这里的水,于是要有定冠词the出现,然后water是不可数名词,前面不会出现a
the children are excited to play in the water.说的是小孩很激动,excited人激动,exciting让人激动的.此处要用形容词.so~