请根据括号中的中文提示、英文释义或句意，写出句中所缺单词，使句子通顺。【小题1】Tom is absent (缺席) from class today. His mum is il

请根据括号中的中文提示、英文释义或句意，写出句中所缺单词，使句子通顺。
【小题1】Tom is absent (缺席) from class today. His mum is ill, he has to look after her at home.
【小题2】We should pay attention to developing (grow and improve) a good habit of study.
【小题3】I received his invitation yesterday, but I didn’t accept it because I had something more important to do.
【小题4】Our earth is becoming dirtier and dirtier. We should try our best to reduce the pollution (the state of being dirty)
【小题5】He will write to me as soon as he reaches (到达) Paris.

解析：【小题1】be absent from意为“缺席，不在场”；故答案为absent【小题2】pay attention to中的to为介词，所以后面的动词用ing形式，又根据括号中的解释意思是“养成”；应该用develop最合适；故答案为developing【小题3】根据后面的原因状语从句because I had something more important to do.可知是没有去；故答案为accept【小题4】根据前面的句子可知，我们应该尽全力减少污染。故答案为 pollution【小题5】as soon as引导的原因状语从句用一般现在时表示将来时；故答案为reaches

我明天再问问老师，叫他解释下这个问题