Q: Keywords: entrance, gate, mark
What is a sentence that includes all these keywords?

A: torii gate marked the entrance to a sacred space

Q: Keywords: doctor, operation, watch
What is a sentence that includes all these keywords?

A: A doctor is watching as a operations is occurring.

Q: Keywords: heart, isolate, shape
What is a sentence that includes all these keywords?

A:
the planet earth shaped as a heart and isolated