—The charity walk begins _______ 9.00 a.m. Don’t be late. —No problem.
— He hardly spent any time on his subjects, _________?—_________, so he did badly in his lessons.
Lisa doesn’t know ______ she and her friends can do to help the little boy ______ parents have left their hometown for making money.
— How long has Robert __________? — Since 2004.
________ people________ walking along the beach.
I think Sun Yang was one of _____ in the 2012 Olympic Games.