根据句意及括号内所给单词提示，完成句子。

1. Don't be          (worry) about it.

2. —What are they over there?

    —They are ____(mouse).

3. —What can I do for you, madam?

    —I want three ____(kilo) of sugar.

4. I need ____(buy) some books.

5. —How many ____(bottle) do you want?

    —Four.

样本量太小可能得出假阳性或假阴性的结论（）

A.Ⅰ档

B.Ⅱ档

C.Ⅲ档

D.Ⅳ档

E.Ⅴ档