`C` nhé ( dòng `2` )

`A`: Sai 

`->` Sửa: toothache `->` headache ( dòng `1` )

`B`: Sai

`->` Sửa : when he went to bed and got up in the morning. ( dòng `1` và `2` )

`D`: happy `->` worried ( dòng `3` ) 

I had a very bad headache when I was young. I had a headache when I went to bed and it was still there when I got up in the morning. I took medicine from many doctors but it just made me more tired so I became very worried.

A. The writer had a very bad toothache when he was young.

`=>` đề bài là headache chứ không phải toothache

B. He had a headache only when he went to bed.

`=>` I went to bed and it was still there when I got up in the morning

C. He took medicine from many doctors...

`->` Dẫn chứng; I took medicine from many doctors but it just made me more tired so I became very worried.

D. He was happy.

`=>` I became very worried.