The chairman thought _____ necessary to invite Professor Smith to speak at the meeting.
| A．that | B．it | C．this | D．him |
20.This is the small house less than 15 square meters,under _____ roof lives a large family of three generations.
| A．which | B．that | C．its | D．whose |
17. They can't be working now. It's time they ________ the office.
| A．have left | B．would leave | C．could leave | D．left |
30.---Can I watch the World Cup games tonight?
---_____.I know you have a lot of homework to do tonight.
| A．Don’t worry about it. | B．It’s out of question. |
| C．It’s out of the question. | D．It’s reasonable. |
29.There have been several new events _____ to the program for the 2008 Beijing Olympic Games.
| A．add | B．to add | C．adding | D．added |
28.He is quite confident,_____,in my opinion,is most important for his future development.
| A．how | B．that | C．what | D．which |