-What‟s this? - ________.
)Come and have a look at these bags in red. We sell them _____ very good prices.
)—Are your __________ workers (工人)? —No,.
—________ is the math book? —It’s in the bookcase.
)—Is this girl your sister? —_________.
)— Do Lucy and Lily have _________ tennis ball? — No, they don’t have one. They don’t like playing ______ tennis.