All children between the age of 5 and 16 in his country must （go to）school．
Please put the book back to its （right or correct）place after you read it．
Mrs. Wang，a new （顾客）of our shop，has become my friend．
Lily is proud that she was born in a city with a long （历史）．
If everyone thinks about pollution and recycling，we can protect the air and help （救）our world．