根据句意或中英文提示写出所缺单词。

1. Water covers about three quarters of the earth’s ____________.(表面)

2. _____________(though) he is very clever, he doesn’t work hard at his lessons.

3. Are you ___________ (sure) Mr Wang will come to our meeting?

4. ______________ with life on Earth, life on Mars will be better in many ways.(比较)

5. The Great Wall is one of the ____________ (unusual things that fill people with surprise) in the world.

下列哪一项宜用氯胺酮、羟丁酸钠复合麻醉（）

A.中枢神经系统病变需颅内手术患者

B.较严重的高血压患者

C.烧伤手术病人伴哮喘患者

D.整形外科手术伴心血管疾病未经很好控制者

E.颌面外科手术伴癫痫患者