根据括号中所给的汉语写出单词，使句子意思完整正确 
I don’t know why I haven’t heard from my parents________(最近).
We are about the same age,but our__________(经历) are quite different.
Mr Jiang is a famous scientist with lots of___________(知识).
We should try our best to protect the_____________(环境).
——Do you have a camera?
——Sorry, I_________(借) it to Jim last Wednesday.