It is the idea____smiles can get rid of cold ____has been proved by the researchers many times.
We hope that you can _______ practical ideas to deal with this problem.
The electricity was cut off by the storm, and thus all the lights_______.
_______me, he walked up to me, smiling.
--- I regret_______ you John has been fired. --- I can hardly believe my ears. He is such a fine worker.
The message is very important, so it is supposed _______ as soon as possible.