一、1.Word Formation

　　0. That______(science) began to study Russian in 1999.

　　1. Please mind your______(behave) in public.

　　2. The boss showed such______(patient) that he cut short my presentation.

　　3. The green light is on, and children can cross the road in______(safe).

　　4. This idiomatic______(express) seems out of style. today. We seldom use it.

　　5. Their lives were frequently______(threat) by earthquakes and volcanoes.

　　6. Though he is over 60, my grandfather always looks fresh and______(energy).

　　7. The young are on their way to make great______(contribute) to society.

　　8. I'm______(gratitude) to you for all the help you've given me.

　　9. The book written by this Nobel Prize winner is really worth______(read).

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