UnScramble this Word: a d e c k c r?

Questions

In 1984, who sang 'girls just want to have fun'?

In 1986, what was the maximum fuel capacity imposed in formula 1 racing?

In 1989 michael bolton won a grammy with this song that asked a question?

In 982 eric the red discovered _____?

In a famous opera, siegfried understood the speech of birds after tasting ______?