Must we hand in our exercise books today?

Must we hand in our exercise books today? Must we hand in our exercise books today?中的HAND是什么意思 Must we hand in our exercise books today?这里为什么是用介词in? must we hand in our exercise books now; can you buy this kin --Mr.john,we must hand in our homework today,_______? 英语翻译Need we hand in our exercise books before class?Jim will Must we hand in our homework tomorrow must we hand in our homework now? -Mr.Wu,must we hand in our reports today?-No,you ___.A.mustn must we hand in our homework today?yes,you ____/no ,you ____ ——Mr John, we must hand in our homework today, ______? …… --When shall we hand in the exercise-books?--____sooner,____