1. Although Minh is poor , he stills helps the orphan.
2. Mai advised her to have a holiday after hoa's examination . 
3. You are not allowed to walk on the grass.
4. I don't mind looking after your dog when you go on holiday.
5. It was a kind of computer that i was not familiar with.
6. The bus was so crowed that i couldn't get a seat.
7. Jack would rather me not to say anything about the missing money.
8. If you happen to find my wallet , could you let me know ?
9. By the time he had read the book , he knew what the answer was