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.

短文改錯(cuò)  
假定英語(yǔ)課上老師要求同桌之間交換修改作文，請(qǐng)你修改你同桌寫的以下作文。文中共
有10處語(yǔ)言錯(cuò)誤，每句中最多兩處。錯(cuò)誤涉及一個(gè)單詞的增加、刪除或修改。
增加: 在此處加一個(gè)漏字符號(hào)（∧），并在其下面寫出修改的詞。
刪除: 把多余的詞用斜線（＼）劃掉。
修改: 在錯(cuò)的詞下劃一橫線，并在其下面寫出修改后的詞。
注意:
      1. 每處錯(cuò)誤及其修改均僅限一詞；
      2. 只允許修改10處，多者（從11處起）不計(jì)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 (朝鮮) _____ 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.