精品一区二区免费在线观看_国产精品久久久久久av福利软件_97成人精品区在线播放_国内成人精品一区

【題目】No one has yet succeeded in explaining the ________of how life began.

【題目】________ what way did you work out the Maths _____?

【題目】Work is hard. ________ trying and you'll be successful in the end.

【題目】The whole street is full of rubbish and it smells ________.

【題目】You'd better ________ too much time ________ football.

【題目】The price of the coat is so ________that I can't buy it.

【題目】A: I'm sorry I stepped out for a smoke, I was tired.

【題目】The book you've just _______(lend) to me is really interesting. I really enjoy it.

【題目】Which do you think is the _______(hot) month of the year in our country?

【題目】The novel is written from _______(person) experience.