Rewrite sentences with the same meaning to the first one.

The article is about smartphones. They have become excellent study tools.

The article is

There is no better teacher in this school than Mrs. Jackson.

=> Mrs. Jackson is

If she doesn’t water these trees, they will die.

=> Unless

The man is a famous actor. You met him at the party last night.

=> The man whom

 It wasn’t Tom in the mall yesterday because he was in the hospital. I’m sure. (can’t)

=> Tom

 It's possible that Joanna didn't receive my message. (mightn’t)

=> Joanna

lot /people/ choose/ favorable date/ occasions/ such/ wedding/funeral/ house moving days. //

nowadays/ our lives/ improved/ much/ progresses/ science and technology//