新概念2练习册第20课答案是练习册,不是课后选择A

(1)I went into the room without knocking.
(2)Why don't you go by bus instead of going by train?
(3)I left the restaurant after paying my bill.
(4)On leaving the hotel ,I met an old friend of mine.
(5)She's capable of being very rude.
(6)He's not afraid of telling you what he thinks.
(7)I must apologize for notphoning you yesterday.
(8)He's very keen on fishing.
(9)She's always been interested in keeping fit.
(10)You should congratulate me on winning the conpetition.