Infinitives or Gerund?

I can't promise _ (be) on time.

_ (swim) is better exercise than running.

Would you like _ (come) to a concert on Saturday?

Do you mind __ (not talk) so loudly?

It was very interesting _ (see) my old school friends again.

On Sundays, Emma likes __ (relax and not do) anything.

Is it difficult _ (learn) Japanese?

James is very competitive. He thinks __ (win) is the most important things.

Excuse me, I need __ (go) to the toilet.

We're thinking of __ (go) to Mexico for our holidays next year.