choose the right word

1 She ___ the birthday cake for three hours.
a. made b. will make c. has been making
2 He phoned me ___ twice after my holiday.
a. some b. enough c. only
3 John rented a new apartment and so ___ his sister
a. did b. does c. do
4 He's ready to start. So ___
a. I b. I am c. am I