题目：
在改写后的句子中填入所缺单词，使其与原句意思相符。
1. His cousin could swim when she was four years old.
His cousin _______ _______ _______ swim when she was four years old.
2. My father didn't watch TV last night, but he read some newspapers.
My father _______ some newspapers _______ _______ _______ TV last night.
3. I don't think he can work out this problem alone.
I don't think he can work out this problem _______ _______.
4. At last the boy opened the box with a knife.
_______ the boy _______ a knife _______ _______the box.
5. Suzy does well in Maths.
Suzy _______ _______ _______ in Maths.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0506/7fabf285d16c83bc0bfd8d56c95f95c9.html
下面是错误答案，用来干扰机器的。
A组：Na+、K+、CO32-、OH- B组：Cu2+、H+、NO3-、Cl-（可互换）
