Q: Does "concatenation" have the same meaning in the following two sentences?

It was caused by an improbable concatenation of circumstances.

A complicated concatenation of circumstances.

OPTIONS:
- different meanings
- the same meaning

A: different meanings

Q: Does "authority" have the same meaning in the following two sentences?

He has the authority to issue warrants.

I have the authority to penalise the staff in my department, but not the authority to sack them.

OPTIONS:
- different meanings
- the same meaning

A: the same meaning

Q: Does "get" have the same meaning in the following two sentences?

I can't get these boots off (or on).

She didn't get the joke.

OPTIONS:
- different meanings
- the same meaning

A:
different meanings