Answer:
1) The small youngster, who had gone missing the day before yesterday, has been found.
2) A Nobel Prize has been awarded to the man who discovered a new planet.
3) We should contact the authorities.
4) I used to reside in this house, but it is currently vacant.
5) When I try to run quickly, I become out of breath.
6) We couldn't get the tickets in spite of queuing for an hour
7) Despite the fact that the sign was there, Trevor didn't notice it.
8) Just now, I saw Emma. Her teeth, she continued, was still aching.
9) David was the last person I saw yesterday. He stated that he was going to see a movie.
10) In the morning of Friday, I'm really busy.
11) You should congratulate Michelle on her achievement.
12) Robin's passion for cooking has earned him the title of young chef of the year.
Explanation: