填入一个适当的词补全对话，每空一词。
A: Come in, please.
B: Glad to see you at home. I'm here to give back the 1______ you lent me.
A: Did you enjoy it?
B: I'm 2______ not. I only read a few pages and then gave up.
A: Why? Isn't it interesting?
B: Maybe, but I had to stop to look up new words in a dictionary frequently (频繁地).
A: Why 3______ guess their meanings?
B: Sounds good. May I borrow another one and have a try?
A: Certainly. What 4______ this book? It's easier and I think you'll be interested in it.
B: It's very kind of you. Thank you very much.
A: 5______ welcome.
