(例) A. I was so hungry that I ate a lot of bread.
B. My (hunger) was such that I ate a lot of bread.
1 A. He learned important lessons in his life because he was poor.
B. He learned important lessons in his life through his ( ).
2 A. We should improve in our production efficiency.
B.( ) should be made in our production efficiency.
3 A. Children become so energetic after a good night's sleep.
B. Children are full of ( ) after a good night's sleep.
4 A. We know more about the risk of global warming than we did before.
B. We have greater ( ) about the risk of global warming than we did before.
1.poverty 2.improvement 3.energy 4.knowledge