题目内容
在下列各句的空白处填入一个适当的词, 使句子意思表达完整, 语法正确。
1. Teachers always tell students to arrive on _________ for school every day.
2. As we know, dogs are our friends because they are __________ of friendly and smart.
3. Elephants can walk for a long time and never get ________. They can remember places.
4. My brother is _________ on the phone to his cousin about his family and delicious food .
5.Today, people down many trees. So many animals are in danger.
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