Having lived in China for 8 years, Helen has a good ______ of both English and Chinese.
—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.
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)
I'm afraid he's more of a talker than a doer,which is ________ he never finishes anything.(2011·山东)
I'd like to start my own business—that's ________ I'd do if I had the money.(2011·江西)
Scientists study ________ human brains work to make computers.