The time and effort he has devoted during the past few years____ trees in that remote area is now considered to be of great value．

— Is Nie’er Library ______ to ordinary people?— Of course.

Boys and girls, you should know what a great difference good manners in public will ________ to a person.

In order to reduce   air pollution, many people want  a total _____on the playing of firecrackers (鞭炮)in many cities during the Spring Festival.

Our foreign trade has________greatly in recent years .