根据括号中所给的汉语写出单词，使句子意思完整正确。
小题1:I __________ (推荐) David as the new chairperson of the Students’ Union yesterday.
小题2:Our class is _________ (分成) into four groups .
小题3:They have some difficulty making __________ (决定).
小题4:Green can give you energy, as it __________（代表）new life and growth.
小题5:Millie kept a __________ (日记) when she was travelling in Europe..