The United States _______ fifty states , one of which is separated from the others by the Pacific Ocean.
The village has developed a lot _______ we learned farming two years ago.
—Come on,please give me some ideas about the project.—Sorry.With so much work _______ my mind,I almost break down.
My MP4 player isn’t in my bag.Where _______ I have put it?
Jenny hopes that Mr.Smith will suggest a good way to have her written English _______ in a short period.
The book is of great value. can be enjoyed unless you digest it.