–What about going to the movie tonight, Alan?--Sorry, I am busy ____ a report. ______, it is raining cats and dogs.
There's no way of knowing why the man fails,____ he is always hard-working and wise.
--Shanghai Pudong Airport please! I must get there by 7.--____,but I'll try my best.
The research group ____ 15 members has made great achievements in recent years.
When the star fell ____ the darkness quickly at night,all the people felt it amazing.
It's an either-or situation.You can watch TV or play games,but you can't do ____.