The thief denied to steal the jewelry although the police forced him to admit it. Which of the underlined words is grammatically incorrect?

We always try to avoid___________ preserved foods.

He was sentenced to two years’ imprisonment after he confessed __________.

Rudi broke his leg in the accident; therefore , he will have Amir to drive him to his work. Which of the underlined words is grammatically incorrect?

___________ a skillful photographer, a person should have both manual skill and a good eye for detail.

As I found out that not all of the workshop participants knew about today’s schedule, I got my secretary __________it right away.