. –Mary, is this ______ umbrella?–No, it’s not mine. It is _______.

Are you going to Tom’s birthday party?—_________.I might have to work.

________.And very day for fishing,isn’t it?

Some Maths problems in this book are difficult for the students work out.[ ]

Hi, Tom. Is this your dog?－No, it’s Cathy’s. _________ is at home now.