题目内容：

根据括号中所给的汉语写出单词，使句子意思完整正确 

1.I don’t know why I haven’t heard from my parents________(最近).

2.We are about the same age,but our__________(经历) are quite different.

3.Mr Jiang is a famous scientist with lots of___________(知识).

4.We should try our best to protect the_____________(环境).

5.——Do you have a camera?

——Sorry, I_________(借) it to Jim last Wednesday.