Which of these sentences is correct?

Choose the most suitable option to complete the sentence.

Now I can see quite clearly that the big red car has _____

a) The cost of living has raised 3% in the past year

b) The cost of living has risen by 3% in the past year

c) The cost of living raised 3% in the past year

d) The cost of living rraisen by 3% in the past year

a) The landlord has risen the rent

b) The landlord himself raised the rent

c) The landlord has risen the rent

d) The landlord has raised the rent

Your hair needs ___ -before you go back to school.

Which of the following is the correct sentence?

Fill in the blank with the appropriate words/word: I've _________ some shopping to do.