小博士：仔细观察下面的句子，找找看，它们的用法有什么不同呢？试着填写完下表。
How much is that cap?
It's seven dollars.
How much is the long T-shirt?
It's thirteen dollars.
How much are these pants?
They are thirty dollars.
How much are the socks?
They are twenty dollars.
你看看下面的句子正确吗？不对的请你把它改正。
1．How much is this caps?
________
________
2．How much are those socks?
________
________
3．How much is these T-shirt?
________
________
4．How much are that pants?
________
________
5．The apples are seven yuan.
________
________
