_____is a big problem.

_____is a big problem. big problem what to read is a big problem. Population is a big s___ problem. have a big problem什么意思 英语翻译：Hong Kong is a big city with a big problem-a problem wi Hong Kong is a big city with a big problem-a problem with mo pollution is a serious problem in big cities throughout the ---I think it is going to be a big problem Big schoolbags have been a big problem for students for a lo A _____is a hundred years I doubt _____is a doctor