We’ll watch      the birds fly.（   ）

A．how

B．what

C．when

—________do you play football? (   )
—At three in the afternoon.

A．When

B．What

C．Where

---_____ pens do you see? (   )
---Three.

A．How many

B．How much

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.

_____ about you? (   )

A．When

B．How

C．What’s