Workers can’t be made ________ for twelve hours a day.
The 29th Olympic Games _____ in Beijing in 2008.
Students in Beijing _____away many books to the Hope Schools since 2009.
--- What did Lucy do yesterday afternoon? --- She ____ her parents do the housework.
Parents always ask their children ___ all kinds of difficulties bravely.
If you’re strict with yourself, you_____ great progress.