Recently Lindsay hasn't felt herself. She____(be) a really good student, but her grades has fallen since three months ago. This is because she sometimes has trouble ____(pay)attention to her study. She also refuses to talk with teachers and friends. What's worse, she feels____(tire) all the time but has difficulty in falling asleep.____she does is brought to her mother's attention.____, when her mother asks her what happens to her, she just says she feels like ____(cry).

    As a matter of fact, Lindsay is suffering ____clinical depression(临床抑郁症). What is clinical depression? It can be described as a mood which is so low that affects your everyday life____(serious). The first sighs of it in teens are ____(poor) school reports than before, then learning difficulties and staying away from classmates and teachers. If you have these signs, don't worry. It is not so difficult to deal with clinical depression. There are many effective ways, such as medicine,____ (express) of feelings, more exercise and a balanced diet.

下列句子中，划线词语使用不当的一项是（ ）

帕拉米韦氯化钠注射液是治疗H7N9亚型禽流感的有效药物之一．帕拉米韦的化学式为C₁₅H₂₈N₄O₄．请回答：