-----What are you doing?----- _________. It is too dirty.
—If you have any trouble, be sure to call me.— ______.
Xiao Yang _______ Xiao Wang in 2005. They ______ for 7 years.
“They have a lot to eat and drink.” It is a structure of ________.
Lots of people are wondering ________.
The population of China is _______ than that of _______ country in the world.