This notebook is not      .

Don’t worry about     ,Mom. I can take care of     ..

 —Whose books are these? —Maybe ________ Lucy’s.

—How about the pollution in the countryside?—Luckily, it's not as serious as _______ in the big cities.

 --- Whose hat is this? --- I think it can’t be John’s or Kate’s. It’s much too small for __________.