When people cut down big trees, new trees should be planted. ,they will have no trees to cut down in the future.
Jack almost fell off the cliff, but managed to _____ until help came.
The storm sweeping over this area now is sure to cause _____ of vegetables in the coming days.
Don't _____ the news to the public until we give you the go-ahead (许可,准许).
If you _____ your demand, then maybe you will have more chance of getting what you want.
His _____of the aeroplane was correct in every detail and could really fly.