Problem: Word: keep

Sentence 1: Keep my job for me while I give birth.

Sentence 2: The students keep me on my toes.

Same meaning?
A: different meanings

Problem: Word: keep

Sentence 1: Can I keep my old stuffed animals?

Sentence 2: I can not keep track of all my employees.

Same meaning?
A: different meanings

Problem: Word: piece

Sentence 1: It is not known who created this piece.

Sentence 2: I need to rest for a piece.

Same meaning?
A: different meanings

Problem: Word: work

Sentence 1: I will work hard to improve my grades.

Sentence 2: John worked with Paul on the task.

Same meaning?
A:
the same meaning