3.The 　　 (twelve) man in a football team will play if one of the other players is ill.

答案：twelfth

2.-The boss said we had only three days to finish the work.

-Don't worry.We have already got through two 　　 (three) of it.

答案：thirds

1.As the 　　 (twenty) century came to a close，the raw materials for a great national literature were at hand，waiting to be used.

答案：twentieth

10.解析：表示“当作，作为”，用as。

答案：as

9.解析：表示“在”具体某一天用介词on。

答案：on

8.解析：表示“在”某个大城市，用介词in。

答案：in

7.解析：表示“在某人的眼中”是in the eyes of sb.。

答案：in

6.解析：表示“对某人特别”是be special to sb.。类似的还有be kind/friendly to sb.等。

答案：to

5.解析：在被动语态中表示动词的执行者，用by。

答案：by

4.解析：表示在某年或某月用介词in。

答案：in