In January , 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
I wish you ______ go with me tomorrow.
We ________ the difficulty together, but why didn’t you tell me?
He will _______ you next week if he is free.
Oh, Mary, why are you killing your time this way ?Can’t you find something____ doing at all?
Many families were broken up and their members were killed in the _______ caused by the earthquake inYaan.