Choose the correct options.
It was
There was
There were
It was
They were
a lot of trees in Australian forests last summer.

Koalas are in danger.
There was
There were
It was
They were
not in danger last year.

There was
There were
It was
They were
a lot of relatives on my grandma's birthday yesterday.

There was
There were
It was
They were
warm and sunny last Sunday.

There was
There were
It was
They were
a park opposite my house, but now there is a shopping centre.