____the problem of land erosion(侵蚀) getting more serious, the government is searching for a way to deal with it.
The boss left Tom __________ the whole company when he was in hospital.
-Thanks for your help, but can you do me one more favor, please? -__________,sir. What's it then?
The two years of study under the famous professor __________ his mind and improved his character.
This is his only request that the room __________ after being used.
Our English teacher requested that the homework __________ tomorrow morning.