Help me with the please

Accelerate-increase in amount or extent.

When I press the gas pedal the car accelerates in speed.

Crucial-decisive or critical, especially in the success or failure of something.

It's crucial for me to pass this test or I will fail the class.

Inhospitable-harsh and difficult to live in

I don't like to go camping because I find the camp grounds inhospitable.

Mere-the smallest or slightest

For my date I like to wear a mere amount of makeup.

Pioneer-a person who is among the first to research and develop a new area of knowledge or activity.

I would like to thank the pioneer who thought of the idea of pizza.