Complete the sentences with about, at, in, on or up.

1. You have to keep …....... trying.
2. Laura is going to give …............. studying Physics.
3. I'm not keen …............ working in a laboratory.
4. Are you good …............... proving hypotheses?
5. Is Harry thinking …....... going back to college?
6. Stella is interested …......... studying both Physics and Astronomy.