第一节单项填空(共15小题；每小题1分，满分15分)
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21．—Does he miss his friends most while studying abroad?
—No． his family．
A．They are B．Those are C．There is D．It is
22．The university where Li Hua is studying is a world-famous one， was set up
more than 150 years ago．
A．what B．where C．which D．that
23．When I arrived home it was getting close ．midnight
A．to B．at C．for D．until
