Trees are very important to our environment. They can stop wind from blowing the earth away.

The 2010 Expo will take place in Shanghai, ________ many countries consider a good chance to introduce their cultures to the world

______ we clean the classroom at once–No, you _____. You____ clean it afterschool.

Hobo，can I eat the hamburger—Sure，if the dishes .

下列词语中，没有错别字的一项是( )