根据首字母或中文提示提示写出句中所缺单词，注意使用正确形式
They took the children on field trips to o______________ plants and animals.
Mr Wang s_____________ his family by teaching evening classes.
His encouraging speech i______________ us to try again and never to give up.
Every morning little Peter d______________ newspapers from house to house. In this way, he can earn his school fees.
Yuan Longping had  s______________ for decades to find out a way to increase rice harvests and eventually he succeeded.
Some people began to buy the new house because the price has been r_________________.
Scientists have made many important _______________ (探索，发现).
Jane Goodall tried to make the rest of the world understand and _____________ (尊重) the life of these animals.