从A、B、C、D四个选项中，选出可以填入空白出处的最佳选项，并在答题卡上将该项涂黑。
21•Since the new director took office，We have worked——hours，一Ⅱlat is to say,we work more freely．
A．flexible B．compulsory C．strict D．endless
22．—I'm dead tired．I Can’t walk any farther,Robert．
一 Tommy．You candoit!
A．No problem B．No hurry C．Come on D．That，S OK
