Q--Has every astronaut survived their space journey?
A--My step-by-step reasoning: In 1986, the space shuttle Challenger exploded during launch, killing all astronauts aboard. In 2003, the space shuttle Columbia also exploded, again killing its entire crew. Various other space flights have resulted in fatal disasters.
So, the answer is no.

Q--Does frost mean that it will be a snowy day?
A--My step-by-step reasoning: Frost forms regularly in areas that experience freezing temperatures and morning dew. Frost isn't deposited from the sky like snow, it forms on the ground.
So, the answer is no.

Q--Would Marvel's Gateway be envious of the Doctor (Doctor Who)'s TARDIS machine?
A--My step-by-step reasoning: The Doctor (Doctor Who) used the TARDIS, a largely unreliable time traveling machine, to travel through time and space. Gateway is a Marvel comic character linked to the X-Men comics. Gateway has the power to create wormholes that allow him to travel through time and space.
So, the answer is no.

Q--If one of your feet is in a leg cast, should the other be in a sandal?
A--
My step-by-step reasoning: If you are using crutches, it is advised to have non-slip shoes with a closed toe. Most sandals do not have non-slip traction and, by definition, don't have closed toes. If you are in a leg cast you are likely to be using crutches.
So, the answer is no.