根据所给汉语完成下类句子,每空一词
学好英语并不很困难
It ___ ___ ___ to learn English well
我认为乘飞机去上海不太贵
I ___ think flying ___ Shanghai ___ too expensive
我一周有两天时间呆在奶奶家
I stay at my grandmother's home ___ ___ ___