I was at the circus yesterday.It...fun!There ...lots of animals there:elephants,monkeys and lions.There...two funny clowns too!Their hair...red and their hats...orange.I...very happy!

it was fun         

There were lots of 

There were two funny clowns

Their hair were red and there hats were orange

I was very happy

I was at the circus yesterday.It was fun! - ед. число

There were lots of animals there:elephants,monkeys and lions.- множ. число

Ther were two funny clowns too!- множ. число

Their hair was red and their hats were orange.- сначала - ед. число- потом -  множ. число

I was very happy!- ед. число