（ ） is mentioned above, the number of the students in senior schools is increasing.
（A）What
（B）As
（C）That
（D）It
Jack, （ ） to the concert enjoyed it very much.
（A）I went with
（B）with whom I went
（C）with who I went
（D）I went with him
He studied hard at school when he was young, （ ） contributes to his success in later life. 选项：
（A）as
（B）therefore
（C）which
（D）so that
