选择合适的短语填空。
(1)—Here are two hats, ________do you like?
—I like the green one.It's so nice.
(2)—Why are you unhappy________?
—Because I always have a lot of homework to do.
(3)—Which brush do you want,Kitty?
—The one________.
(4)—________.Can you tell the differences between them?
—Of course.