вставить фразы в пропуски в нужном порядке

Dear Ms BurtonI'm writing to find out more informationFirst of allSecondlyThank you in advance for your helpI look forward to hearing from youYours sincerely

1.Dear Ms Burton

2.I am writing to find out more information

3.First of all

4.Secondly

5.I look forward to hearing from you

6.Thank you in advance for your help

7.Yours sincerely