—Listen ! Helen is singing in the next room.It ____ be Helen. She has gone to Beijing.
—Do you have a tennis ball? —____________. Let’s ask Jim for help.
—Do you like history? —Yes. I think it’s _________. I can know much from it.
—What’s her favorite __________? —She likes strawberries best.
We have nice socks __________ very good prices.
His brother is _________ years old. This Monday is his _________ birthday.