There is a saying that "Never put off until tomorrow what you can do today."
________ that the Youth Olympic Games might be delayed due to severe air pollution, our government has made a promise to Jacques Rogge that they will spare no effort to settle the problem.
During the flood many students volunteered ________ through the weekend, giving out food and water for the victims.
Our waste recycling project ________ a lot of investigation and paperwork had been done by the end of last term.
Every morning Jack's wife will stand before the mirror, ________ carefully until she has to go to work.
________ for a whole night, we still couldn't agree on when to start and where to go for the holiday.