6.

1.doing     2. with   3. fall down   4. off    5.burn   6. ride

7.scratch   8. dangerous

7.

1. Why shouldn't I climb that tree ?

2. Is Nga going to run down the stairs ?

3. Don't play with the neighbor's cat because it may scratch you.

4. Why shouldn't your sister ride her bike too fast?

5. You should wear a helmet when you ride your motorbike.

6. She shouldn't jump into the lake because she may drown.

7. He fall off his bike and broke his leg.

ex 6

1. doing

2. with

3. fall

4. off

5. burn

6. drive

7. scratch

8. dangerous

ex 7

1. Why shouldn't I climb that tree ?

2. Is Nga going to run down the stairs ?

3. Don't play with the neighbor's cat because it may scratch you.

4. Why shouldn't your sister ride her bike too fast?

5. You should wear a helmet when you ride your motorbike

6. She shouldn't jump into the lake because she may drown

7. He fall off his bike and broke his leg