Preposition review: By, With, For, From

I bought this gift ___ my friend.

She traveled to Paris ___ train.

The letter is ___ the company.

He works ___ a computer all day.

She borrowed a book ___ the library.

They went to the party ___ their colleagues.

This coffee is ___ you.

He received a bonus ___ his hard work.

She baked a cake ___ her sister's birthday.

He fixed the problem ___ using a new tool.