----In recent years, _____problem of global warming has become very serious. ----That’s right. People are facing _____diversity of natural disasters now.
The world is _____ seven continents and four oceans.
The boy wanted to ride his bike in the street, but his mother told him _____.
He kept the light in his room ______ the whole night.
----- We haven’t heard from Jane for a long time. ----- What do you suppose ______ to her?
In the USA, he made a lot of friends ______ English well to make himself ______.