There is still much to discuss；________，we shall return to this topic at the next meeting.
| A．yet | B．therefore |
| C．otherwise | D．however |
----- As we know, you won’t go back to the USA since you have established a research center here．But how long _____ in America?
----- For almost 10 years．
| A．did you study | B．have you studied |
| C．were you studying | D．have you been studying |
----- It appears that your relationship with Mike is not normal, doesn’t it?
----- I thought of him as a trustworthy friend _____, to my shock, he gave me away to the boss．
| A．unless | B．since | C．for | D．until |
It was an exciting moment for these football fans this month, _____ again Sun Wen appeared on the football pitch．
| A．that | B．where | C．which | D．when |
After the fire, _____ would otherwise be a cultural center is now reduced to a pile of ashes．
| A．that | B．it | C．what | D．which |
------ What do you think of the concert?
------ I really enjoy it．I didn’t expect it was ______ wonderful．
| A．more | B．very | C．most | D．as |