—Mike, the office is in a mess; it's your turn to clean it up. —________ I did it yesterday and the day before yesterday.
24. Is this park ________has been built to keep the milu dear?A. which C. the one C. that D. the one that
23. Environmental experts are those who devote ______to______ nature and environment.
22. __________unexpected advice they have given us!
21. To many teenagers the cellphone is not only _____useful tool but also ____ way to have fun and be cool.
Young people who have got jobs may realize university lessons can’t be the only preparation for all of the situations ________ appear in the working world.