The boysknock ___Uncle Wang’s door and shout “trick or treat”. He gives them some candy___a treat.[ ]

I don’t like music which I can’t sing along with.—Me, ______.

It happened ________ the morning ________ September 10, 2008. [ ]

We never know____________ because happiness is everywhere.

Mrs.Smith,please teach me how to draw on the computer today.—Oh,no. ____.You have to get familiar with the keyboard first.