With sufficient scientific information a manned trip to Mars should be _____.
AIDS is said_______ the biggest health challenge to both men and women in the earth over the past four years.
It was April 29, 2010 Prince William and Kate Middleton walked into the palace hall of the wedding ceremony.
If you______to her about it yesterday, you ______ what to do now.
______ no bus, we had to take a taxi to go to the station.
I don’t think the color of the curtains ______ the color of your room perfectly.