根据句子意思选出正确的单词。
How long  How old   How far   How much   How many 
1.—________ is it from Beijing to Tianjin?—It's about 125 kilometres.   
2.—________ is your mother?—She is forty years old.   
3.—________ is the Great Wall?—It's about 6000 kilometres.   
4.—________ students are there?—There are forty-­five.   
5.—________ is this book?—It's five yuan.

选择恰当的单词填空。

1. Let’s go ________ to school.
2. The weather is hot ________ Chongqing.
3. Say good­bye to your mother ________ me.
4. Don’t forget ________ do your homework.
5. I’ll go to Beijing ________ June 1.