• All students who don't hand in their papers will fail in the exam.

• I saw many houses that were destroyed by the storm.

• The street which leads to the school is very wide.

• The system which is used here is very successful.

• Trains which leave from this station take an hour to get to London.

9. All students not handing in their papers will fail in the exam.

10. I saw many houses destroyed by the storm.
11. The street leading to the school is very wide.
12. The system used here is very successful.
13. Mr.John, teaching my son, is my neighbor.
14. Trains leaving from this station take an hour to get to London.