________somanypeopleintheUnitedStatesbeenoutofworkastoday.
You________gonow.It’sgettinglate.
Constructionoftherailwayshelpedtodevelopthenational_______ofTanzaniaandZambia.
Thewealthofacountryshouldbemeasured________thehealthandhappinessofitspeopleaswellasthematerialgoodsitcanproduce.
设函数y=e^x+1，则y''=（）
