The most serious problem _our teacher is… a.facing to b.faci

The most serious problem _our teacher is… a.facing to b.faci The most serious problem _our teacher is为什么不能填FACE the most serious problem facing the new government is how to what is the most serious problem facing the world?why?how ca 14.Is the environment the most important problem facing the The most serious problem ________the new government is how t the teacher told us that pollution (is) a serious problem in What are the most serious social problems China is facing no （）pollution is a serious problem to the human race.A.how to What do you think is the most criticial problem facing China The whole world is trying to ( ) the serious problem resulti The ______(照顾) of the old is a serious problem.