依兩句句子文法有冇問題?

I have completed the full-time internship program provided by ABC Company during the summer holiday for three months.

In the studies of engineering programs, i expected to learn technical and useful skills that help me to enrich my caree in that field.

句子一:
I have completed a(1) full-time internship program provided by ABC company during the summer holiday for about(2) three months.

remark (1) 用 "a" 好過 "the"
remark (2) 要加 "for", 用 "about" 好過 "approximately"


句子二:
During my (3) studies of engineering(4), I have learnt(5) technical and useful skills that can help me to enrich my career in the field.

remark (3) 用 "During my" 好d
remark (4) 可delete "programs"
remark (5) 您呢句係咪過去式(巳經讀完)? 如果係, 用"have learnt" 好過 "expect to learn"。"expect to learn" 有指將來的意思

句子一:
I have completed the full-time internship program provided by ABC (Company) during the summer holiday approximately three months.


句子二:
In the studies of engineering programs, I expect to learn technical and useful skills that can help me to enrich my career in the field.