Problem: Word: undo

Sentence 1: I wish I could undo my actions.

Sentence 2: Fortunately, we can undo most of the damage to the system by the war.

Same meaning?
A: the same meaning

Problem: Word: waste

Sentence 1: Waste heat.

Sentence 2: We waste the dirty water by channeling it into the sewer.

Same meaning?
A: different meanings

Problem: Word: fix

Sentence 1: Fix a race.

Sentence 2: Let's fix the picture to the frame.

Same meaning?
A: different meanings

Problem: Word: scrub

Sentence 1: Engineers had to scrub the satellite launch due to bad weather.

Sentence 2: We had to scrub our vacation plans.

Same meaning?
A:
the same meaning