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Verbi irregolari al past simple

Quali sono le forme corrette di questi verbi irregolari?

Domanda 1:
They ? a new car last week.
1 bought
2 buyed
3 bouyed
4 brougt
Domanda 2:
He ? a song at the karaoke bar.
1 sing
2 singed
3 sang
4 sung
Domanda 3:
We ? to Paris for our vacation.
1 flyed
2 flied
3 flought
4 flew
Domanda 4:
She ? a letter to her friend in Australia.
1 wrote
2 written
3 writed
4 write