`1.` Because everyone suffers from the common cold at some time or other.

`-` Dẫn chứng: Everyone suffers from the common cold at some time or other. (câu đầu)

`2.` No, it isn't

`-` Dẫn chứng: It isn’t a serious illness, but people spend a lot of money on medicine. (câu hai)

`3.` The medicine makes people cough less, make them feel better, and stop their nose from running for a while.

`-` Dẫn chứng: That is, it can make you cough less, make you feel better, and stop your nose running for a while. (câu `4`)

`4.` People drink a lot of hot water with sugar, lemon juice to feel better.

`-` Dẫn chứng: People also drink a lot of hot water with sugar, lemon juice. (câu `6`)

`5.` Because it has a lot of vitamin C.

`-` Dẫn chứng: It helps provide with a lot of vitamin C. (câu cuối)