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．---You look tired after _____ search for the missing boy．
---Yes, I prefer to head for _____ bed as soon as possible．
A．a; the B．the; the C．the; \ D．\; \
22．They paid fifty percent of _____ they were able to earn to the state．
A．that B．which C．what D．whom
