—Look! A book is on the floor. Whose is it?—It ______be Rick's. It has his name on it.
--- ________ give them some good books?--- —Good idea!
— 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.