A. A LOT OF B. A FEW C. MANY D. FEW

2) READING: Read the passage then choose the best answer: In most schools around the world, PC classes begin the same way. First, students jog for a few minutes and then they stretch. The same happens in sports clubs and gyms. Why? Well, according to most people warming up and stretching help us to avoid injury. Recent research, though, shows that they might be only half right. Health and fitness experts all agree on one thing. Warming up is very important before we exercise. But what exactly is warming up? According to Kieran O'Sullivan, a sports scientist at the University of Limerich in Ireland, when you warm up, you should do a few minutes of light exercise that is similar to your full exercise session. So, for example, runners should jog lightly for 2-3 minutes before they begin a run. When you warm up, your heart rate increases and your muscles heat up so that your body is ready to begin exercising. Yes, What’s right…you don't have to stretch! Stretching regularly helps the muscles become flexible, and over time, this can help you move fast and freely with less chance of injury. But there is no research that proves that stretching before exercising prevents injury. Actually, it might do the opposite! As O’Sullivan explains "When you stretch, sometimes your body thinks that your muscles are in danger. So instead of loosening, they tighten up. This could cause an injury when you exercise afterwards." So, when is a good time to stretch? Most experts say the perfect time is at the end of your exercise session when your muscles are warm and loose. You can even stretch before going to bed at night. The important thing is not to exercise afterwards!