---Why do you keep the windows open on such a cold day? ---There are so many students here, so we want to keep the air nice and __.
The global financial crisis(金融危机)has made many people________their money.
To________nature is to help ourselves,or we will be punished.
—Whose T-shirt is this? —It________be John’s.It’s________small for him.
—It’s difficult for village children to cross the fiver to school. —I think a bridge________over the river.
Jack________dislike the weather in Beijing in spring,because there is so much wind and sand.But now he________it.