Put the verbs in brackets into the to-infinitive or the -ing form. How do the sentences differ in meaning?

1
a John forgot to stop (stop) by the post office on his way home.
b Nick will never forget .......... (be) wrongly accused of shoplifting.
2
a Stop .......... (complain) about the service. The waiters are doing their best.
b Why don’t we stop .......... (get) something to drink? I’m thirsty.
3
a Try .......... (visit) the shopping centre during the week when it’s not so busy.
b I tried .......... (get) him to spend less money, but he wouldn’t listen.
4
a I regret .......... (spend) so much on that formal gown.
b We regret .......... (inform) you that we are unable to give you a refund.
5
a Remember .......... (bring) your credit card with you.
b Do you remember .......... (visit) that little antique shop in the centre?