1—5 CCBDA 6—10BBDAD 11---15 BCDBD
1----5 C D B B C 6------10 BAACA 11------15 B A B D C
1.Because you have more chances to challenge yourself.
4.When you are in trouble at school, your friends will help you.
5.Happiness is always around you.
1. need 2. drivers 3. stop 4. driving 5. against
6. safely 7. over 8. red 9. pictures/photos 10. together
1-5 A D D B C 6-10B D A D C 11-15 B A C A C
1-5 ACBDD 6-10 C D B D C 11-15 ACBCA
1.First of all, it makes the heart beat faster and increases the blood pressure. The cigarette smoke also reduces the amount of oxygen in the blood. Consequently, the heart has to work harder, with less oxygen. Finally, your arteries will narrow faster if you smoke.
2.stupid ，grow up
3. If you smoke, you are twice as likely to die from a heart attack.
5.smoking is good for our health.
Speaking; attention; against; others; if
allow; dangerous; busy; careful; slowly