第二节语法和词汇知识（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。
6． They went on well at first but eventually everything ______ they had worried about happened．
A．which B．what C．that D．when
7．Mike seldom asks ______ questions in class, but today he raised ______ fairly good one．
A．/; a B．the; a C．/; the D．/; /
