A:Hello , Anna . Come in and sit down . B: Hello , doctor . A: What's the matter ? B: I've got a backache . A: Do you often suffer from backache ? B: No , I don't . I've never had a bad one before . A: When did it start ? B: About four days ago . A: Well , go home and rest in bed for two days , then you'll feel better . B: Can you give me some medicine ? It's very painful . A: Yes , I'll give you some pills . Take one a time and three times a day , and come back in <MASK> . If you don't feel ...
three days two seconds four months