Answer:
Metaphor:
My teacher is not very nice, she has a heart of stone.
Simile:My teacher does not get angry very easily she is as cool as a cucumber
Neither:
My dog runs around very playfully during summertimes.
Step-by-step explanation:
Heart of stone means that someone has a very cold and unkind nature.
Cool as a cucumber means that a person is calm and very relaxed.