（1）原式=2-3+2+3=4；
（2）原式=a+2a-a=2a．
. He was lucky in the accident, but his ___________ car is under repair.
A．hurt
B．damaged
C．destroyed
D．ruined
书面表达。
假设你是宁宁，本周参加了学校的英语角，本期的英语角正在就宠物展开讨论，请你根据下面提出的问题发表一下你的看法吧。
Questions: 1. Why are there so many people who keep pets at home now'?
2. What should we know if we keep a pet?
要求：1. 语句通顺，语法正确；2. 70词左右。
Hello, everyone. I am Ningning. _________________________________________________________________________________________________________________________________
That's all. Thank you.
