Rewrite sentences with the same meaning to the first one.

We get lost because we don’t have a map.

 If

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//