Shanghai is the first city in the world ____a high-speed maglev train, from the city to Pudong Airport.
When the students heard the news, all of them were in _____.
_____ will conquer nature.
I earn 10 dollars _____ hour as _____ supermarket cashier on Sundays.
As a result of destroying the forests, a large _____ of desert _____ covered the land.
David helps his mother with her housework every Saturday for about _____.