вставить пропущенные : Have,was,were 
"...you ever been to the Kremlin?"- Of course,we... .We ... there last Sunday"
"My little sister ... not been  to the zoo yet."
"...your little sister ... not been there?"- "Yes,he ... .He ... at the zoo last  week-
end.But I ... not been there for ages.Let(на верху запятая)s all go together.It(запятая)s
worth visiting in May"
They ... already been to the museum.They ... there last month.

Нужно просто определить какого числа существительное, стоящее перед глаголом was/were. 1)was.2)were.3)were, was.4)was.5)was.6)were.

Have you ever been to the Kremlin? - Of course,we have .We were there last Sunday""My little sister has not been to the zoo yet.""your little sister has not been there?"- "Yes,she hasn't .She was at the zoo last weekend.But I have not been there for ages.Let's all go together.It'sworth visiting in May"They have. already been to the museum.They were there last month.