You are working too hard.You’d better keep a between work and relaxation.
(2012·天津，3)
A. promise
B. lead
C. balance
D. diary
网友回答
A. promise
B. lead
(答案→)C. balance
D. diary
解析：
句意为：你工作太努力了。你最好保持工作和休息之间的平衡。keep a balance保持平衡，符合句意。keep a promise遵守诺言；lead带头，领先的地位；diary日记。