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1.That is so because reports received through the grapevine are supposed to be secret.
supposed to be 本应如此，应该，猜想会
You were supposed to be here an hour ago.
你应该在一小时之前赶到这里。
The pilots were supposed to drop supplies to the snowbound villages, but the local government was poor and they pranged up the whole operation.
飞行员应该给那些被雪封住路的村庄空投救济物质，但地方政府经济困难，这使该计划的实施陷入了困境。
