---How long do you think it will be __________ China sends a manned spaceship to the moon?--- Perhaps two or three years.
—It cost me 30 yuan to get here. —Well, it was crazy of you to take a taxi _______ you could come by bus as well.
—Will you go shopping now? —Not until I ________ my experiment.
Every child is _____ to it parents.
She forgot to tell me which bus to _____.
At the moment of the sunset, the sky turns _______.