Вопрос по английскому языку:

Помогите сложить предложение!
1. When was Nelson Mandela born?
Nelson Mandela was born in 1918.
2.How long..................................?
He was in prison for twenty-eight years.
3.When..........................................?
He left prison in 1990.
4.When..........................................?
He became President of South Africa in 1994.
5.How old............................ in 1994?
He was seventy-six.
6.When........................................?
He got married for the third time on his eightieth birthday.