阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。注意：答案写在答题卷上。
The weather is getting hotter. Having taken exercise, we will become much   (thirsty). A cold drink may be just  thing. But most of us are never concerned about what we drink. There are plenty of “energy drinks” on the market. Most of them have an attractive color or cool name. Something that looks cool may be harmful to our       (safe).
 a careful check, we may find that most energy drinks have lots of caffeine(咖啡因) in them,  (typical) aimed at young people, students, busy people and sports players. Makers sometimes say   drinks make us better at sports and can keep us awake. be careful not to drink too much.
Research by Australian scientists found caffeine makes our heart beat fast, which in most energy drinks is at least as strong as  in a cup of coffee or tea and that many teenagers  (affect) by caffeine. There are possible health risks connected with energy drinks. Just one can of energy drink can make us nervous,   (cause) heart attacks. So why not stop drinking it right now?