A dog is always wellknown as a clever and friendly animal正确答案：众所周知，狗一直是聪明而友好的动物。

It is known to all that exercises are good for health.正确答案：众所周知，锻炼有益于健康。

众所周知,钻石是最坚硬的物质。正确答案：It is well known that diamond is the hardest substancematerial.

It is well known that coal is an important source of energy.正确答案：众所周知，煤炭是重要的能源。

众所周知，中国是世界上最大的发展中国家。正确答案：As is known to all, China is the largest developing country in the world.

众所周知，锻炼有益于健康。正确答案：It is known to all that exercises are good for health.

公寓作广告 （4字常用语）谜底：众所周知

人民冷暖恩来晓 （打一成语）谜底：众所周知

三人家庭，七天看完 （打一成语）谜底：众所周知

恩来住宅不保密 （成语，卷帘格）谜底：众所周知