---I find the more we study, the more difficulty we have ________ out Maths problems.---Oh, I agree with you. Maths is more and more difficult.
—How is it going? —. I’m sick(生病的) today.
—Who’s in the room? — Mr. Brown is. He a letter now.
Why not to the park this weekend?
It is raining, so I stay at home.
I think taking a walk is boring.