They are very good at ... (dance).
dancing
Please, stop ... (sing)!
singing
I don't know when ... (call) you.
to call
... (ski) is easy.
Skiing
They told me how much ... (pay).
to pay
It's difficult ... (learn) a new language.
to learn
I'm bored with ... (cook).
cooking
I'd like ... (have) a Porsche.
to have
Don't forget ... (lock) the door.
to lock
I don't like ... (do) housework.
doing
... (play) scrabble is my favourite hobby.
Playing
It's always nice ... (get) chocolates.
to get
Is he afraid of ... (talk) to people?
talking
She's going to Australia ... (see) kangaroos.
to see
Let's try ... (run) faster.
to run
He decided ... (go) to New York.
to go
He spent four hours ... (study) vocabulary.
studying