you () out enjoying yourself when you ought to have been studying.应填would be 还是were?

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• You were out enjoying yourself when you ought to have been studying.
• you () out enjoying yourself when you ought to have been studying.应填would be 还是were?
• 1._____I go out to play now,Mum?No you ——.You shuold do your homewerk first.A.Must;must`t B.Must;wouldn`t C.May;needn`t D.May;had better not2.____you like to have a walk with us this evening?A.Did B.Would C.Shuold D.Can3.You____be caerful when you cross here ---the traffic lighs aren`t working.A.could B.might C.ought to D.may4.We were all waiting for you ;you___for the seaside by yourself without leaving a message.A.mustn`t ;leave B.needn`t leave C.sh
• Are you two enjoying yourself?
• 树干被台风吹断折成与地面成30°角,树干底部与树尖着地处相距20米,求树干原来的高度