His grandparents used to ________ a walk after dinner, but now they are used to ________ a walk after breakfast.
—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.