The correct answer

Can you help me ?

Choose the correct answer:
1-Which of the following sentences is preferable?
a. The project only lasted three months.
b. The project lasted only three months.
2-If you have one sister, which of the following sentences is correctly punctuated?
a. My sister Julia has been working on a novel at her local Starbucks.
b. My sister, Julia, has been working on a novel at her local Starbucks.
3-Which of these sentences indicates that all of the students received awards?
a. I gave awards to the students who had earned perfect scores.
b. I gave awards to the students, who had earned perfect scores.
4-For some reason, last month he ___ not to go to the zoo with the class.
a. choose
b. chose
c. chosen
5-This Hawaiian Kona coffee is ___ wonderful!
a. special
b. especially
c. specially