It is a good world for us to walk around 是啥意思?

It is a good world for us to walk around 是啥意思? it is good for us _______(walk) after meals It ()(be)good for us to walk after meals. it is good for us to be动词是哪个? 索引 A Big Mac,please.A walk is good for us.A walk is great fo it is good for you to have friends around It is a good time for us to ______ thanks to our teachers.A. it took him four and a half years to walk around the world 改 it is good for us It is a fact that the world around us is ____ changing. It's a wonderful world for us to travel () it is all around us when we walk aand play.