Your paper ____(must,hand)in as soon as the bell___(ring) 怎么填
问题描述：
Your paper ____(must,hand)in as soon as the bell___(ring) 怎么填
答
must be handed （被动语态） rings（一般现在时，表示现在进行时（将来））
答
Your paper _mast be handed___(must,hand)in as soon as the bell__rings_(ring).
只要钟一响，你的试卷得马上交了。
答
must be handed . rings
答
must be handed in rings
答
must be handed .rings