I like penguins because they are ______ interesting.
I have ___ useful grammar book. It was a present for my mother.A. a B. an C. the
The teacher made him _________ his homework.A. to do B. did C. do
---I have finished my homework ,let’s watch the program I AM A SINGER on Hunan TV.---_________.
---We can use QQ to talk with each other on the Internet.---Really? But can you tell me _______it.
Now the air in Yancheng is _______ than it used to be . Something must be done to stop it .