---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.
There is"s" inword "sit".
– Remember to close the door when you leave . ---
– Could you tell me tomorrow morning ? – Well, it will start at 9 clock .
— Must I do my homework now? —No, you ____________. You do it later .
I found a boy _________ in the corner of the street on my way to the supermarket.