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Bài tập 2: Choose the underlined part that is incorrect in each of the following sentences.

(Chọn phần gạch chân sai trong mỗi câu sau.)

1. When I was going to school, I was seeing an old friend.
A. was going B. was seeing C. school D. old

2. At this time yesterday, it rained heavily.
A. time B. yesterday C. heavily D. rained

3. I listened to the radio when the fire alarm went off.
A. listened B. when C. went D. fire

4. They were searching for information for their project about public shelters while their parents gardened.
A. were searching B. for C. gardened D. project

5. We did an experiment in the lab when the earthquake happened.
A. did B. in C. earthquake D. happened