1. 选择合适的词语填空。

How long   How old   How far   How much   How many

1. （1） — is it from Beijing to Tianjin?

   —It's about 125 kilometres.

3. （2） — is your mother?

   —She is forty years old.

5. （3） — is the Great Wall?

   —It's about 6000 kilometres.

7. （4） — students are there?

   —There are forty-­five.

9. （5） — is this book?

   —It's five yuan.