While my mother________ some washing, I was making a kite for Mary.
In the car market, I have to choose ____ because I don’t have enough money for my favourite.
—He’s not married Laura, ____? —____. They will celebrate their one year of marriage this Sunday.
The second Asian Youth Games will be____ in Nanjing in August, 2013.
Jack felt nervous when he found the physics problems ____ to work out.
Only 16 percent of China’s area ____ covered with forests, so ____of us should protect trees.