下列说法中正确的是（　　）

判断对错．

把 $\frac{5}{6}$ 的分母扩大2倍，要使分数值不变，分子也扩大2倍．

①奉献会充实人们的生活②奉献让人感受到生活的美好③奉献让人感受到生命的价值④奉献会让人感受到帮助他人和造福他人的欢乐

阅读下面的句子，根据首字母或中文提示在空白处填入适当的单词。

Are you facing a situation that looks impossible to fix?

    In 1969, the pollution was terrible along the Cuyahoga River near Cleveland, Ohio. It ____(be) unimaginable that it could ever be cleaned up. The river was so polluted that it ____(actual) caught fire and burned. Now, years later, this river is one of ____ most outstanding examples of environmental cleanup.

    But the river wasn't changed in a few days ____ even a few months. It took years of work ____(reduce) the industrial pollution and clean the water. Finally, that hard work paid off and now the water in the river is ____ (clean) than ever.

    Maybe you are facing an impossible situation. Maybe you have a habit ____ is driving your family crazy. Possibly you drink too much or don't know how to control your credit card (信用卡) use. When you face such an impossible situation, don't you want a quick fix and something to change immediately?

    While there are ____(amaze) stories of instant transformation (转变)，for most of us the ____(change) are gradual and require a lot of effort and work, like cleaning up a polluted river. Just be ____(patience).

阅读短文，根据短文内容及首字母提示，在空白处填入一个适当的单词。

FAJTHFUL（忠诚的）TO DEATH

    Some time ago, a fire broke out(爆发) in a building late at night. Nearly all the families were s____ inside the house. After the firemen came, they rushed into the burning building and saved the people to the safe p____.

    The crowds thought a____ the people were safe. But it was not so. Two little orphan （孤儿) girls were still asleep alone at the very top of the building, in a small room. N____ thought of them. Luckily, they lived with a dog.

    The dog tried to wake them up, but f____. He ran to the window and barked(吠叫) loudly for help. B____ no one noticed him. Then he climbed down the ladder (梯子) and tried to pull a fireman to the ladder. The fireman kicked him away, thinking he was mad. Then the dog ran to a____ fireman, jumped on him, ran to the ladder, barking all the time and looking back as if he was asking the fireman to follow him.

    This fireman realized there must be someone in the little room, as the dog was acting so strangely. So he followed the dog u____ the ladder, there he saw the two girls and saved them.

    Where was the d____? A brave fireman rushed into the room to look for him and found him lying near the window, choked (窒息) with smoke. He brought him down with care, but he was already d____. He had given his life for his friends. What a faithful friend!