An invention is a new way of solving a problem, so try our best to think of many ________and unusual ways.
As is reported, it is 100 years _____ Qinghua University was founded.
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.