Although many Americans move a lot ,they still _______and understand each other’s dialects.

You thought I was the boss? Whatever gave you that________？

 Computers can do a lot of things nowadays, but _____ more still need to be done by man.   

I have ________ everything that happened，as I remember it.

It is reported that in our country cities ________ heavy air pollution that is 30 percent above the national standard or higher should try to meet standards by 2030.