ПОМОГИТЕ СРОЧНО((((((((((((((

5.Circle the correct alternatives.

a.If I had more money, I will buy / bought /
would buy a sports car.
b.You don't have to / can't to / mustn't swim in
the sea today - it's too dangerous.
c.Our house built / was built / is build in the
1930s.
d.I'm sorry, but you can't to go / can't go / can't
going in. It's private.
e.Mount Everest is the higher/highest / most
high mountain in the world.​