1/ It was my first time to go abroad.
2/ Is this seat empty?
3/ Don't be noisy!
4/ This is the key of my room.
5/ He's a student of Hong Kong University.
6/ He had a child of his former wife.
7/ Is there any place for me in the car?
8/ "Chan" is a popular family name in China.
9/ He got 85 points in Chemistry.
10/ He likes red tea.

What's wrong with the sentences?