is it right sentences?

1) On his recent tour, the president was accompanied by his wife.
2)The painter will finish the picture soon.
3)They have been to Britain twice.
4)It was raining at 12 o'clock yesterday.
5)She had known him long before he left for India.
6)The defeated team slowly left the field.
7)Everyone finds the circus exciting.
8)When she met him he was a broken man.
9)Oliver lay covered in mud and dust.
10)At that moment there walked into the room a stout old gentleman, supporting himself with a stick.
11)May I have your book for a moment?
12)Our teacher can speak three languages.
13)your coat is quite new. You needn't buy another one.
14)I'd like to be able to play chess.
15)Students mustn't interrupt their teacher.

Are these sentences right?

.
5)She had known him long before he left for India.

7)Everyone finds the circus exciting.
8)When she met him, he was a broken man.

10)At that moment, there walked into the room, supporting himself with a stick, a stout old gentleman.

There are problems with punctuation in the others.