He would like to trek ___ the jungle of Brazil.A. cross B. across C. through D towards
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.