Misc: In 1990 France announce it will send 4,000 troops to the ---------- Gulf. ?

Questions

What is the only land mammal native to New Zealand?

What is the only letter of the English alphabet with three syllables (no hints please)?

What is the only metal that is liquid at room temperature?

What is the only part of the human body that cannot repair itself?

What is the only real food that U S astronauts are allowed to take into space?