Astrophysicist, I'm not brave enough to be an astronaut! :)

Swim with sharks or run with bears?

Swim with sharks - that's a better survival rate I think...

Would you rather be the first person to explore a planet or be the inventor of a drug that cures a deadly disease?

Explore the exoplanets.

Have more time, or more money?

Definitely more money for now.

Would you rather be able to control fire or water?

Fire, the right kind can burn even water...

Would you rather be bought, or be earned?

Earned. More valuable that way hopefully.

Would you rather have a flying carpet or a car that can drive underwater?

Submarine. Red hot smokers, here I come!

Chair or beanbag to sit in ?

Chair! Preferably a cozy one.

Go camping in a tent or in an RV/trailer?

Used to go with a tent. But now RV comfort please!

Be an amazing painter or a brilliant mathematician?

Painter, not unlike Picasso or Michelangelo. I have only to look at splattered paint to see landscapes...

[S]Grind that axe down to nothing, or twist the knife, counterclockwise...[/s]

Date a cheapskate, or a spendthrift?

That's hard, but a spendthrift. They can spend all their money on me hehe

Live isolated in the woods or live in the heart of a bustling city?

Woods, assuming I would still have the modern amenities of a typical home.

Spend a night stuck in an elevator or spend a night stranded in a boat?

Definitely the boat!

Live by a bustling harbor or on a cliffside overlooking the ocean?

cliffside!

be underwater royalty or have a magical sky ship?

Sky ship (Dreadnought, no less), so steampunk...

Cook over fire, or use electric?

All I have is electric, so no choice. :)

Would you rather be able to control fire or water?

Water! Seems less dangerous.

Would you rather lose your account or break your phone?

Lose what account, Subeta? Subeta's fun but it is in the end just a game. OTOH my landline telephone is an easily replaced cheapy piece of shit. ...phone.

Slip or slide?

Slide...Mine uncertain about any context to attach.

A partner who insists on ordering out every meal every day, or someone who can survive their own cooking while trying to learn?

Someone who can survive their own cooking while trying to learn.

Duck-sized horse or horse-sized duck?