The World Expo 2010 is being held at a time the world is looking for a new kind of balance between nature and cities．
| A．which | B．where | C．when | D．that |
. Being hard-working is of the highest __________ to becoming successful.
| A．important | B．to be important |
| C．importance | D．being importance |
— Did you see _________ jacket on the playground just now?
— Is it _________ new one and very cool?
| A．a; the | B．the; a | C．a; a | D．the; the |
—Why are you standing here?
—I’m waiting for Shirley. She will be back _____.
| A．gradually | B．originally | C．shortly | D．abruptly |
. By the year 2020 scientists _____ a lot of research on AIDS.
| A．had done | B．do | C．are doing | D．will have done |
_____ is commonly believed that the play was written by Shakespeare.
| A．It | B．That | C．What | D．As |