18.The greatest problem for teenagers is that they are too stressed.(1)Gina,a 15-year-old girl,worries about her exams very much.Although she studied English six years ago and is good at it,(2)她還是害怕英語考試。Last night,after coming back home,she began to get ready for her English exam.While she was reading English books,her mother said to her,"Come on,dear!It's time for supper!"But Gina heard nothing.Her mother went on and said,"Gina,I believe that you will pass he test tomorrow."This time Gina answered,"Oh,Mom,(3)I am preparing for the English exam now.I'll have it later." But at 11:30 p.m.,the light in Gina's bedroom was still on.Her mother said to her,"(4)我認為青少年們不應該在考試前熬夜。"Gina agreed,but she couldn't fall asleep. She was too nervous.(5)Maybe it's important to help the teenagers like her.