10. A before 引导的是时间状语从句，填空句为主句，而此主句为一祈使句，故动词用原形。下面五题也都选A，道理是一样的：

(1) Before you send the letter, _____ with Bill to see if the address is right.

A. check 　　　 B. to check 　 C. checking 　 D. checked

(2) If the car won’t start, _____ it.

A. try pushing 　　　 B. try push 　　 C. to try pushing　 D. to try to push

(3) If they don’t understand it the first time, _____ over it again until they do.

A. go 　　 B. to go C. going 　　　 D. to be going

(4) If you’re going on a long car journey, _____ sure the vehicle’s in good condition.

A. make 　　　 B. to make 　　 C. making 　　 D. having made

(5) If you hear the fire bell, _____ cool and don’t panic.

A. keep B. to keep 　　 C. keeping 　　 D. kept　

9. B to make wine 为目的状语。

8. A believe it or not 是习语，用作插入语，其中的 believe 只用原形。

7. A remember doing sth=记住曾经做过的事，remember to do sth=记住要做的事。

6. A 注意句子的谓语是 was，getting this report done in such a short time 是动名词短语，用作句子主语。

5. C 现在分词短语在此表示伴随。

4. A 句首的 to test eggs 为目的状语，填空句为祈使句谓语，故用动词原形。

3. C caught cheating 为 who is caught cheating 之省略。同时注意句型：catch sb doing sth (逮住某人做某事)。

2. B anyone seen carrying bags…为 anyone who was seen carrying bags 之略，其中过去分词短语 seen carrying bags…用作定语修饰代词 anyone。

1. B when 引导的是时间状语从句，填空句为主句，动名词短语 having a good teacher 为主句主语。