阅读下面短文，用括号内所给动词的适当形式填空（必要时可加助动词或情态动词）
The largest problem among teenagers is that they are too stressed. Mary, a 16-year-old girl, 小题1:      .(worry) about her exams very often. Although she小题2:     .(study) English for three years, and is good at it, she is still afraid of English exams. Last night, after小题3:     .(come) back home, she 小题4:  (begin) to get ready for her English exam. While she小题5:        (read) English books, her mother said to her, “Come on, dear! It’s time小题6:      (.have) supper!” But Mary 小题7:      (not listen) to her mother. She went on reading. Her mother went on, “Mary, I believe you. You can pass your exam tomorrow.” But Mary still went on studying. At 11:30 the light in her room 小题8:       ( be )still on. Her mother said to her, “I think teenagers 小题9:        (go) to bed earlier before exams than usual.” Mary agreed, but she 小题10:       .(not fall)asleep. She was too nervous. Maybe it is time to solve the teenagers’ problems.