planes will be very larg but flying will be very cheap?(改错)

planes will be very larg but flying will be very cheap?(改错) Planes will be very large so flying will be very cheap will planes very large so be will cheap be flying very 连词成句 单项选择：Planes will be very large ___ flying will be very cheap planes will be very large so -------【fly】will be very cheap这 Planes will be very large soflying will be very cheap如何翻译 英语填空,planes will be very large so flying will be very ch____ will pianes very large so be will cheap be flying very连 f___in planes will be cheap Planes will be very large so fiying will be very Planes will be very cheap in the future（改为一般疑问句） Will flying in planes be expensive or cheap?这句话是什么意思呢?