---Where have you been? ---I got caught in traffic, otherwise I _______ here earlier.
There is clear evidence _____ the most difficult feeling of all to interpret is bodily pain.
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.