---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.
I don’t like learning math. Because it’s not so _______ as English.
—How much does the pen _____ you? —Ten yuan
He was so _______ after he knew the ________ news.
Japan lies _______ the east of China.
We have got a ticket _____ 300 yuan ______ the sofe sleeper.