this is to certify that造句

1、This is to certify that is the employee of our company.
兹证明是本公司雇员，现已获准休假两周。

2、This is to certify that the applicant li Jia is the son of li Yi, li Yi is the father of li Jia.
兹证明申请人李甲是关系人李乙的儿子，关系人李乙是申请人李甲的父亲。

3、This is to certify that Sam passed reading level one.
兹用以证明山姆通过了第一阶段的阅读测验。

4、This is to certify that the bearer, Mr. A is an acquaintance of mine.
本证明书持有人A君是我熟悉的朋友。