求求英语大侠帮帮忙啊!这篇短文的填空我硬是想不出来.晚上就要答案了,

求求英语大侠帮帮忙啊!这篇短文的填空我硬是想不出来.晚上就要答案了,
A:Come in,please.
B:Glad to see you at home.I'm here to give back the ___ you lent me.A:Did you enjoy it?
B:I'm ______ 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.A:Why __not guess their messages?
B:Sounds good.May I borrow another one and have a try?
A:Certainly.What ____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:________ welcome.