24.We didn’t understand what he said.

　 We didn’t understand _____ _____.

23.He paid 280 yuan for the bike.

　 He ____ 280 yuan ____ the bike.

22.She’s been a League member for over two years.

　 She ____ the League two years _____.

21.The watch is too expensive for me to buy.

　 The watch isn’t ____ ____ for me to buy.

20.12岁大的人

19.驾驶执照

18.需要睡眠

17.举例

16.数学考试失败

15.对。。。严格