Read and judge.（阅读理解，判断对错，对的画“√”，错的画“×”）

Amy: What colour is your sweater?

Bill: It is white.

Amy: Whose trousers are they?

Bill: I don't know. What colour are they?

Amy: Grey. Are they Tom's?

Bill: No, Tom's trousers are black. I know, they are Mike's.

( )1. Bill's sweater is white.

( )2. Tom's trousers are grey.

( )3. Mike's trousers are grey.