Engines are to machines ________ hearts are to animals.
A．as B．that C．what D．which
The last time we had great fun was ________ we were visiting the Water Park.
A．where B．how C．when D．why
(2010·江苏)—I prefer shutting myself in and listening to music all day on Sundays.
—That's ________ I don't agree.You should have a more active life.
A．where B．how C．when D．what
Part of the reason Charles Dickens loved his own novel，David Copperfield，was ________ it was rather closely modeled on his own life.(2010·北京)
A．what B．that C．why D．whether
I'm afraid he's more of a talker than a doer，which is ________ he never finishes anything.(2011·山东)
A．that B．when C．where D．why
I'd like to start my own business—that's ________ I'd do if I had the money.(2011·江西)
A．why B．when C．which D．what
