There is _______ “u” and _______ “s” in the word “use”.
You know a lot about Chinese history, don’t you?–Yes, I ___________ China for a long time since 1998.
The old man has____ useful horse and horse can do a lot of things for him.
Do you know the way _____ the library? —No. But I think Daniel _____.[ ]
______is very important for us to learn English well.