【2013丹东】—When did you start to collect stamps?—I got my ______ stamp when I was ______ years old.
The river will be dirtier and dirtier________we do nothing to protect them.
—________ —I have a fever.
—Mum,I have a cold. —You________go to a doctor.I’ll take you to hospital.
The doctor advised my father to________smoking.
They are used to________classical music and it makes them feel relaxed.