Пожалуйста помогите 4 упражнение сделать

1 When did Hollywood become the centre...
  a) 1914
2 Why did film directors choose Hollywood
  a)         (точно не знаю)
3 When did they make...
  a) 1927
4 When did Hollywood celebrate...
  a) 80
5 How many films did they make...
b) 600