1．He didn’t come to school yesterday because of his i________．

2．“Do as the Romans do”is an old s________．

3．I can say her name out quickly because we always stay in t________．

4．You’d better tell your parents no m________ where you go．

5．I was too tired and fell a________ soon last night．

6．It’s a difficult________ (决定)for any doctor．

7．One day，you will realize the________(重要性)of time．

8．I can’t be a nurse，for I have no ________ (耐心) ．

9．Hard working is the key to________ (成功) ．

10．The little baby has six________ (牙齿) ．

The little baby has two ________ already.

1. A.
   tooth
2. B.
   tooths
3. C.
   teeth
4. D.
   teeths

 The little baby has two _______ already .

    A. tooth                  B. tooths             C. teeth              D. teeths

  The little baby has two________.
A. tooth   B. tooths   C. toothes   D. teeth

 The little baby has two _____alreadly.

A. tooth      B. tooths     C. teeth     D. teeths