what is the correct answers?

The seat belt ( ) the flight attendant before the plane took off.

- was fastened by
- was fastening
- has been fastened by
- was fastened

They produced a prototype ( ) we could assess its pertinence.

- in order
- so than
- so that
- in order to

As she( )out of the taxi, it started to rain.

- was getting
- gets
- has gotten
- getting

If you take the bus on a regular basis, you ( ) buy a weekly pass.

- ought
- should have
- should
- ought to have

The colleague ( ) car broke down wanted to go faster.

- whose
- which
- whom
- who's