题目

Attitude Is Everything The story is about how a donkey got out of a deep hole. The donkey’s owner, a farmer, thought __61___ impossible to save his donkey and decided to bury it. __62___, the donkey managed to get out __63____ the help of the soil put in by its owner. From the story we can see that the donkey was brave and clever enough to save himself. Attitude is everything. I think it’s ___64__ (absolute) true. __65_ we meet with some difficulties, we should calm down and ___66__ brave to face them. Don’t lose yourself in ___67_ (sad) and never give up. We can look at things i17．如图，在四边形ABCD中，AB=AD，AB⊥BC，AD⊥CD，点M，N分别在AB，AD边上．（1）求证：BC=DC：（2）若AM：MB=AN：ND=1：2，求证：MC=NC．