Выручайте пожалуйста люди добрые, буду благодарен.

Выберите правильный вспомогательный глагол.
1) She .... watching TV at this moment. a) does, b) is, c) has, d) were.
2) We .... been discussing the new plan. a) has, b) are, c) have, d) did.
3) Prices .... grown very quickly. a) are, b) will, c) does, d) have.
4) Students can .... writing a test. a) be, b) are, c) have, d) do.
5) They could .... visited that show. a) were, b) did, c) be, d) have.