Какова кинетическая энергия шара массой 500 г, летящего со скоростью 20 м/с?

comeplete the dialog. fill in was or were/

was it interesting at the party at school yesteday?
 yes,it ..... . There ... so many strange people there.
who ..... there?
oh, there .... a lot of funny monsters, merry clowns, brave supermen and kind fairy ladies.
oh, really? a costume party!
and there ... two nice English hobbits.
it 's a pity I ..... not at this costum party.