五、題組:請根據選文，選出一個正確或最佳的答案 (每題2分，共30分)   Steve was a police officer, and he lived near the police station. Steve   1     go to bed early, but Bob, who lived next door, got home late from work every night. He     2   a lot of noise when he walked and threw his shoes on the floor. This kept Steve awake.    One day, Steve went and had a talk with Bob. Steve said, ''I go to work at 5:00 a.m. and go to bed at 9:00 p.m. Could you be quiet after 9:00p.m.? '' Bob said, ''I'm sorry. I will keep the noise down.'' Over the next few days, Bob   3   his shoes down quietly and walked on tiptoe after he got home.The other day, Bob   4   Steve and asked, ''   5     you sleep well? ''Steve said, ''No, I didn't.''     ''Why not? '' asked Bob. ''I usually went to bed after you threw your shoes on the floor. I waited for that noise to come every night, but it never   6    ,'' said Steve.throw/threw 丟 keep/kept 保持 awake清醒的 on tiptoe踮著腳尖
【題組】1. ( )
(A) must
(B) have to
(C) has to
(D) had to