As the pace of life continues to increase, we are fast losing the art of relaxation. Once you are in the habit of rushing through lift, being on the go from morning till night, it is hard to slow down
I don’t think the experiment is ______ failure, because it has provided us with _____ valuable experience for our future tests. A. 不填; 不填 B. a; 不填 C. a ; a D. 不填; a
