答案+为什么
问题描述：
答案+为什么
________(plan)your trip schedule carefully and you will have a more enjoyable journey.
________（host）the Olympics is as much a responsibility as a competition among countries.
答
____Planning____(plan)your trip schedule carefully and you will have a more enjoyable journey.___Hosting_____（host）the Olympics is as much a responsibility as a competition among countries.
一是祈使句,动词原形
二是动词再做主语 加ING