答案：for

　　10．In addition ________ his homework, he has to take extra lessons after school.

　　解析：in addition to 除了......之外(还)。

　　答案：to

　　11．Is he for or ________ this plan?

　　解析：be for or against 支持还是反对......。

　　答案：against

　　12．The ship is heading west ________ great speed.

　　解析：at great speed 快速地。

　　答案：at

　　13．________ conclusion, he expressed his thanks to us.

　　解析：in conclusion 最后。

　　答案：In

　　14．You can find a good solution ________ the problem is you use your head.

　　解析：solution to ......的解决办法。

　　答案：to

　　15．My brother succeeded ________ winning the scholarship.

　　解析：succeed in doing sth. 成功做某事。

　　答案：in

　　Ⅲ.语法填空

Scientists have found that pesticides (农药) harm the ability of bees to find food. Bees must learn which flowers contain their food from the smells of the flowers. __1__ the bees do not learn which smells mean food, they will starve. Researchers in Britain found that