用适当的疑问词完成下列句子。

What   How many   How old   Where   Who  

1.－         is his job?   －He's a bus driver.  

2.－         watermelons can you see?    －I can see eight.  

3.－         is the camera?    －It's on the fridge.  

4.－         is your friend?    －He's thirteen.  

5.－         is that student?   －He's my friend, Xiaofang.