按所给的汉语，用英语完成下列句子。
1. 众所周知，教师的良好品行会对他们的学生产生良好效应。
As we all know, teachers' good behaviour can ___________________________ their students.
2. 大卫问他妈妈压缩食品是否能储藏很长时间。
David asked his mother ___________________________ for a long time or not.
3. 您的建议非常宝贵，对我们的公司帮助很大。
Your ___________________________________, which help our company a lot.
4. 最后，这个小女孩没办法只好去找妈妈帮忙。
At last, the little girl _______________________________ her mother for help.
5. 年轻人应该常向别人学习，而不是卖弄。
Young people should often ________________________________ showing off.
6. 事故发生后，她很担心，不断地打电话给她朋友。
After the accident, she was so worried _______________________ to her friend.
2NH3（g）；△H=－QkJ·mo（Q>0）。