Пожалуйста помогите . Надобно вставить в предложения правильные слова под знаками 1)

Пожалуйста помогите . Надобно воткнуть в предложения правильные слова под буквами
1) our mum ...Already ...A cake
A)has...cooked. b)cooked. C)is cooking

2)yuri Garagin is a legendary ...

A)politician. B) astronaut. C) cosmonaut

3)William Shakespeare was a great ...

A)American playwright B) Russian poet C) English writer

4)my sister is girl ...is good at Maths

A) which B) who. C) whom

5) the show was ...I was ...

A) boring. B) bored bored C) boring

6)next year I ...going to learn to play the piano

A) is. B) am. C) are