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.

I wrote _______ my brother last Saturday, but I haven’t heard _______him up to now.

A. from;  to          B. to;  of       C. to;  to        D. to; from

I haven’t heard from Bill ________ he left here.

A．when                                B．before

C．since                                 D．while

I haven’t heard from Bill ________ he left here.

根据括号中所给的汉语写出单词，使句子意思完整正确 
【小题1】I don’t know why I haven’t heard from my parents________(最近).
【小题2】We are about the same age,but our__________(经历) are quite different.
【小题3】Mr Jiang is a famous scientist with lots of___________(知识).
【小题4】We should try our best to protect the_____________(环境).
【小题5】——Do you have a camera?
——Sorry, I_________(借) it to Jim last Wednesday.