Children’s brains can’t develop properly_______ they lack protein(蛋白质).
—Oh, I failed again —Don’t lose heart. One more time, ________ you will succeed.
Mary does every single bit of housework ______her husband Bob just does the dishes at times.
Tom enjoyed himself so much _____ he visited his best friend in Beijing last year. A. that B which C. when D.where
______ I accept that she is not a perfect girl, I do actually like her.
____ to America, her parents have not heard from her.