第一节：单项填空（共l5小题；每小题l分，满分l5分）
从A、B、C、D四个选项中，选出可以填人空白处的最佳选项，并在答题卡上将该项涂 黑。
21．Some of the exercises appear to be ______ ones that you have done, but after taking ______second look, you will find that they are different．
A．/, the B．the, the C．the, a D．/, a
22．I'm amazed to hear from my old friend again．______,it is ten years since we met last．
A．In a word B．What' s more C．That' s to say D．Believe it or not
