Why do we h_____ to travel by plane?

Why do we h_____ to travel by plane? We should do exercise to keep h_____.(根据首字母提示,完成单词) Why do we go to college? why do human beings live,why do we have to work tiredly. Why do we not go to the beach instead? why do we have to learn Engling?作文 Why do we go to bed?我当然懂...回答... why do we have to learn englisg?是什么句子? Why do we go to bed ?_________________?这么填写什么? why do we feel so diffcult to communicate She is kind to us.We all like h_____ Mr.Zhu looks very busy.We want to help him,but we do not know( ).what to do,how to do,what to do it,why to do why do we study English why do we study English why should we do exercise? Why do we need friends? Why do we need friends? why do we need plants