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

Check your luggage before boarding.

She checked for an instant and missed a step.

A: different meanings

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

May God keep you.

She keeps an apartment in Paris for her shopping trips.

A: different meanings

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

This nest egg will ensure a nice retirement for us.

Our exertions ensured a good outcome.

A:
the same meaning