题目内容：

1. As teenagers grow, it is normal for them to become ________ (困惑的)with the changing world both inside and outside of them.

2 To remember so many words in such a short time is really ________ (挑战性) for an ordinary students.

3. She has been c________ with his friends online all the morning. No wonder she hasn’t finished the task yet.

4. If you eat the right food and exercise r________, you can feel better, look better and have more energy.

5. After a heated a___________, a decision was finally made.