Tranforms the sentences from active voice to Passive Voice​

Где ты был вчера? Where were you yesterday?
Я работаю над этой проблемой уже три месяца. - I have been working on this problem for three months already.
Три месяца назад я работал над этой проблемой. - I worked on this problem three months ago.
Я работал над этой проблемой с 3 до 5 вчера. - I was working on this problem from 3 to 5 o'clock yesterday.
Он всегда работает хорошо. - He always works well.
Завтра он будет работать над этой проблемой. - He will work on this problem tomorrow.
Завтра в три часа они будут работать над этой проблемой. - He will be working on this problem at 3 o'clock tomorrow.
Завтра к трем часам они закончат работать над этой проблемой. - They will have finished working on this problem by 3 o'clock tomorrow.
На следующей неделе к трем часам он уже переведет половину статьи. - He will have translated the half of the article by 3 o'clock next week.

He entered the Aviatoin Institute last year
He didn't  enter the Aviatoin Institute last year
When did he enter the Aviatoin Institute?
Where did he enter last year?
What did he do last year?
My sister studies at the university
My sister doesn't study at the university
Where does my sister study?
Who studies at the university?
What does my sister do at the university?
The third-year students will have industrial training next summer  
The third-year students will not have industrial training next summer 
Who will have industrial training next summer? 
When will the third-year students have industrial training next summer?
What will the third-year students have  next summer? 
What training will the third-year students have  next summer