1．________the Internet is of great help，I don't think it's a good idea to spend too much time on it.
A．If B．While C．Because D．As
2．The queue is too long and there are fifteen persons________me at the moment.
A．ahead of time for B．ahead of C．go ahead D．look ahead
3．Hawking's________to the research of universe deeply moved us.
A．devotion B．concentration C．achievement D．attention
4．At last，she________what she said.
A．came through about B．came through with
C．came through over D．came through on
