Fill in the gaps with the correct forms of the verbs in brackets:
I must remember (post) .......................... this letter today. It’s important.
I can’t remember (post) ....................... the letter. Perhaps it’s still in my pocket.
I’ ll never forget (fly) ....................... over the Grand Canyon. It was wonderful.
The clothes are dirty because I forgot (switch on) ........................... the washing machine.
I regret (spend) ......................... all that money. I’ve got nothing left now.
I regret (say) ....................... that I’ve got bad news for you.
There is too much noise. Can you stop (talk) ............................ , please?
He stopped (smoke) ........................ a cigarette.
The teacher introduced herself and went on (talk) ....................... about the course.
The teacher told everyone to be quiet, but they went on (talk).............................. .