完成对话。在对话的空格中填上适当的单词，使对话完整正确。一空一词。

A：Hello，Steve! Where have you been these days?

B：Hello，Ben! I stayed at home．

A：I didn't notice your seat was empty ____1___ the teacher called names just now．She called your name three times but ____2___ replied．

B：I'm sorry that I didn't call the teacher．

A：I heard that you fell when climbing the mountain last weekend．

B：Yes，I did．Last Friday morning，when I started to climb the mountain the weather was fine．As I ____3___ got to the top of the mountain，it suddenly ____4___．It began to rain heavily and the ____5___ dropped a lot．

A：So you'd better ____6___ at once，for you were cold and wet then．

B：Yes，I did．But walking in the rain was hard for me to keep the ____7___ of my body．So I had a fall and hurt my knee on the way back．

A：Did you see a doctor?

B：Yes．__8___ I still can't walk as usual，there's ____9___ serious．The reason why I have to lie in bed now is my fever ____10___ that．