With more forests being destroyed, huge quantities of good earth _____ each year.[ ]

_______ the crisis of economy (经济危机) getting more and more serious, the government is searching for ways to improve people’s life.

I’m fed up with studying.—What nonsense! You’ve only got one yearmore to do. Then you’ll have your qualification and after that _____________

The officer gave orders that anyone_____ a gunshould be reported to the police station

My time in the middle school was one of periods of my life.