We must try our (our/ours) best to protect plants.They're important to human beings.
China has the largest p in the world,about 1.4 billion.
Sally is from the USA, she is an A .
There are 25 students in our art club. Among us, Sixteen girls and n boys.
Kate doesn't like this one. Please show her (另一个).
The Youjiang River runs (穿过) the city of Baise.