31．Who did Danielle Ferraro’s team study on?

23．

8．It makes no difference to me ________ you go today or tomorrow.

19．

34．What’s the purpose of the fourth paragraph?

24．

2．It is always difficult to stay in a foreign country, ________ if you don’t know the culture of the country.

16．

11．We all feel his parents as well as Jack ________ for the little boy’s bad performance at school.