More and more people think ____ necessary to let the student

More and more people think ____ necessary to let the student More and more people think it necessary to let .为什么这里只用it,而不 1.People think ( )more and more( )to protect the environment People think ＿＿＿more and more ＿＿to protect the environment． i think () necessary () to take more execise people plant more and more trees to protect the earth More and more people began to ______ the relationship betwee Nowadays more and more people are moving to the countruside I think ____ necessary to look for more information about th More and more people in the would want to know more （ ） Chin more and more old people are skiing but it has ____ to do wi Nowadays,more and more people like going to work____ ____(步行