Réponse :

hi,these are my answers

Explications :

2)a.there was

b.there were

c.there weren't

d.there was

3) sentence B because verb to be is conjugated into the past simple and there is no past participle

4) was working,was watching,were fighting,was chatting,were texting,

5) when he heard something

he was working late

she killed him