小题1: If there were more trees on the earth, there would be l_______ pollution.

小题2: I don’t like eating lemon. It t_______ too sour.

小题3: The injured people were taken to hospital i __________  after the accident.

小题4: Look, the expression on his face s       that something bad must have happened to him.

小题5: According to an ancient Chinese legend, the emperor Shen Nong d___________ tea.