It’s _______ thrill to have ______ ten-year research project completed with the desired result.
——Guess what!I met an old school friend last week.——How nice!How long____ each other?
It_____ years ago when the incident took place, and I nearly forget it.
After the earthquake, the president _____ a three-day period of mourning, the first-ever event of its kind for ordinary people.
At the root of volunteering is____ idea that one person may have____ ability to offer services that can help other people.
It is nice to do something for someone else out of the blue and not to expect anything ______.