例句： You must shut the gas supply off if there's a leak.

例句： Threatening skies portend a storm.

例句： The pages aren't in proper order.

例句： The young miner was confident of winning the girl's heart.

例句： Her shrieks pierced the air.

例句： The religious affairs have been reestablished.

例句： We regret that we are unable to reconsider your case.

例句： There are lambs frisking in the meadow.

例句： We exchanged our opinions about the event at the meeting.

例句： She seems indifferent, but deep down she's very pleased.