读下面一段短文，用括号内的所给的适当形式填空，并将正确答案填入短文后的横线上。 A young man works hard at his lessons. He is very busy 1______ (study). He doesn't have tune 2______ (rest). After some time , he falls ill. Every night, when he goes to bed, he closes his 3______ (eye) and tries to sleep; But he can't. He decides to go to see the doctor. He tells the doctor his problem. 'Try 4______ (count) numbers. When you reach 1, 000, you'll fall 5______ (sleep),' says the doctor. The next day the man goes back to the doctor's. 'Well,' says the doctor 6______ ( kind) , 'How are you today?' 'Well,' the young man says, 'I tried counting one, two, three'… up to 1, 000. But when I 7______ (reach) 569, 1 began to feel 8______ (sleep). I had to 9______ (get) up and drink some tea. lien I went on 10______ (count) up to 1, 000 again. But I still couldn't go to sleep.'