It happened ________ the morning ________ September 10, 2008. [ ]

Do you know the answer ______ question? [ ]

Once a year , people take part in “ ______ Lights ” activity to help save energy .

Mary was very busy last week. She did the work all ______ herself. [ ]

Dad, would you please drive __________?— No hurry .We have enough time before the plane takes off.