题目内容：

根据括号中所给的汉语写出单词，使句子意思完整正确。

1.People think that dogs are ___________ (忠诚的) to people.

2.Our class is _________ (分成) into four groups .

3.They have some difficulty making __________ (决定).

4.Green can give you energy, as it __________（代表）new life and growth.

5.The Chinese students kept __________ (日记) when they were travelling in Europe..