In January , 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
—What’s worrying you, dear? —Nothing. I was just thinking about the problem ______ tomorrow.
A Sichuan government official expressed their thanks through CCTV for the aid they ______ in the last three years.
Only after they had carried out over ten experiments ______ the decision.
It’s reported that the price of meat this month is ______ that of last month.
Thank you for sending us ______ vegetables. You have done us ______ great help.