One of the sentences in the pair given below is incorrect. Under the incorrect sentence :-

1. He walked soon.
He walked quickly.

2. Do you know singing?
Do you know how to sing?

3. She waited for the whole day.
She waited for all the day.

4. I cannot say anything on the contrary.
I cannot say anything to the contrary.

5. After examining the questions return the same to the teacher.
After examining the questions return them to the teacher.

Experts please answer