I had trouble finding out the answer _____ the question.
My best friend Jack looks happy, and he always ______ a smile _____ his face.
The number of the books in our library _________ about 20,000.
Betty is careful as I, but I’m than you.
Our school has two months ______ in the summer time.
_______ all the pop singers, I like Xu Song ________ because of his voice.