You’re our manager, so ______ or not you’ll attend today’s meeting is very important.
If you keep on your research, you'll _____ the result in time.
I called the airline to _____ my flight reservation a week ago.
My friend, Tom, left New York in 1976 and _____ since then.
China _____ a sharp increase in the number of Social Networking Services users in the past years.
The two giant pandas are so much alike that it is impossible to ________ one from the other.