1.

Is that idea your idea or Marsha Muller's idea?

YOURS   HERS

2.

The interviewer asks Marsha Muller to talk about Marsha Muller.

HERSELF  

3.

She's bad at languages. Being bad at languages is her greatest weakness.

THAT   IT

4.

The speakers agree with the speakers about one advantage of not being good at languages.

EACH OTHER   ONE ANOTHER

5.

When Marsha Muller travels, she trusts all the people she meets.

EVERYONE   EVERYBODY

6.

There were several travel programmes on the radio last week, but the travel programme with Marsha Muller was the most interesting.

ONE