Spot and correct the mistakes:1. At first the authorities thought the

Spot and correct the mistakes:

1. At first the authorities thought the athlete had been taking drugs, but they soon realized they mixed up the results of the tests. (1)

2. When my cousin came into the room, I didnt recognize her because I didnt see her since she was a little girl. (1)

3. We couldnt find a parking space when we reached the city centre, so we had decided to go by bus the next time. (1)

4. Shakespeare has written thirty-seven plays. (1)

5. I have been waiting for three months before they finally sent me an answer. (1)

6. Until yesterday, I have never seen that man in our office. (1)

7. When did you saw him? Yesterday. (1)

8. I didnt be at school last week, I was unwell. (1)

9. We were in the USA and visitted Alaska last year. (1)

10. While he worked on his laptop, he fell asleep. (1)