来自白延红的问题
雾霾对我们的健康有害，人人都应参与到拯救环境的行列中．Thickhazeisbadforourhealth．Everyoneshould______insavingtheenvironment．
雾霾对我们的健康有害，人人都应参与到拯救环境的行列中．
Thick haze is bad for our health．Everyone should______ in saving the environment．
