从A、B、C、D四个选项中，选出与所给句子划线部分意义相同或相近并能代替的那一项.
The best way to explore the countryside is on foot.
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We did and eight-hour trek yesterday.
The book is a thrilling story.
--Bad luck. I had my purse __________.
--I'm sorry to hear that.
Who can make the naughty boy ________ quiet?
I listened to a CD_________ Heart Strings recently.
We prefer ________ at the party rather than_________.
The house _________ we live is very comfortable.
The watch is ________ tells the time.
It's the most important thing _________ should be done at once.