1。 to explain where the applicant has got the information about the vacancy。 for example， he can learn it from his friends， or in the advertisement， or in some papers， or he just wants to try his luck。

sample： having noticed the enclosed advertisement in this morning‘s south china daily， i wish to apply for the position of sale‘s manager。

2。 to present personal information。 this part should be a description of the applicants age， sex， education， working experience and specialty。 it is in this section that the applicant presents his advantages or qualifications for the position。 details are encouraged， but the applicant should bear it in mind that exaggration or false descriptions are not allowed in the letter。
4。 to inquire the chance of an interview。

sample： i should welcome a personal interview at your convenience。