The cleaners make a great contribution to _____ the city clean.
Chen Guangbiao says he _________ all his money to charities when he dies.
Stay away from junk food, please. It’s bad for us,_________ for children!
If prices rise too high, the government has to do something _________ it.
Don’t forget to wash your hands _________ you have meals.
Look! Jack and his monkey _________ flying disk together in the garden.