pollute proper six powerful they |
51．Schools should do something to help students protect ．
52．If a river is ，farmers can't use the water for their crops．
53．The Internet is more than books．It is influencing our lives a lot．
54．The students who are good at writing can always use words ．
55．Children usually attend a primary school at the age of in China．
Father had his car （repair） in the 4S shop last week．
Lu Chuanjian is one of the most outstanding （飞行员） that I have ever known．
Generally speaking， excellent learners have some good habits in （相同）．
We all like to be with Rita because she is very （诚实） and kind．
Eating too much salt （增加） the risk of high blood pressure．