How did your brother make such a stupid mistake ______ he had a such a good knowledge of the
steps and cautions over operating the machine.

You could hear water pipes cracking _____ they _____ because of the cold.

短文改错  
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共
有10处语言错误，每句中最多两处。错误涉及一个单词的增加、删除或修改。
增加: 在此处加一个漏字符号（∧），并在其下面写出修改的词。
删除: 把多余的词用斜线（＼）划掉。
修改: 在错的词下划一横线，并在其下面写出修改后的词。
注意:
      1. 每处错误及其修改均仅限一词；
      2. 只允许修改10处，多者（从11处起）不计分。
     Grandma Moses was crazy about painting soon before she picked it up and worked hard at it.
She painted careful and her works were nice. She first painted only to please oneself, and then began
to sell her works with a little money. In 1993, a collector, Louis Caldor happen to see several of
Grandma Moses’ work hanging in a shop. He liked them, buying them at once, and set out to look for
less. Caldor held a show to introduce the works of Grandma Moses other artists. Grandma Moses,
who was world-famous, was died on December 13, 1961, at the age of 101.
_______________________________________________________________________________

一 Shall we attend the concert this evening?
一 Great idea, _____ we can do some shopping first.

_____ I know little about architecture, I find that building very impressive.

The US president Obama said his country will sign a peace treaty with the DPRK (朝鲜) _____ the latter gets rid of all its nuclear facilities.

Our teacher looked here and there on our playground________ looking for something.

David often told stories that weren't true, ________no one believed him when he told about a
deer in the schoolyard.

The decision has been made________a new school building be built next month.