3．His ______(良心) troubled him after he took the money.

2．This kind of job requires both skills and ______(耐心)．

1．Our object in providing such models is to train the students’ ______(理解能力)．

10．how去掉或改为that。此处应是一个关系代词来引导宾语从句，how不能做关系代词，所以应用that或省略that。

9．it→them。指代错误。此处指代上文中的birds，所以应用them。

8．beautifully→beautiful。此处作宾语补足语，应用形容词形式。

7．在animals前加other。用other animals以便与birds区分开。

6．to→by。year by year是固定词组，表示“年复一年，逐年”。

5．next前加the。表示过去某个时候的第二天早晨，应用the next morning。

4．√