______you’ve got a chance, you might as well make full use of it.
17. They can't be working now. It's time they ________ the office.
30.---Can I watch the World Cup games tonight?---_____.I know you have a lot of homework to do tonight.
29.There have been several new events _____ to the program for the 2008 Beijing Olympic Games.
28.He is quite confident,_____,in my opinion,is most important for his future development.
27.To our surprise,the student considered_____ in the exam should win an award.