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．--- It's nothing serious. But do remember to take this medicine three times a day.
--- Thank you. ________.
A．Got it B．Heard it C．Make it D．Take it
22．As Senior 3 students, we find it important to a good state of mind.
A．stick to B．attend to C．keep up D．stay up
