Mark the letter a, b, c or d on your answer sheet to indicate the meaningful sentence from the cues given

mark the letter a, b, c or d on your answer sheet to indicate the meaningful sentence from the cues given.  
1. not have/credit card/i/can/not/book/airline ticket/online
a. athough i didn't have credit card, i couldn't book an airline ticket online.
b. i don't have a credit card so i can book an airline ticket online.
c. because i didn't have a credit card, i couldn't book an airline ticket online.
d. as i don't have a credit card, so i can book an airline ticket online.
2. many teenagers/enjoy/do/volunteer work/remote areas.
a. many teenagers enjoy to do volunteering work in remote areas.
b. many teenagers enjoy doing volunteering work in remote areas.
c. many teenagers enjoy do volunteering work in remote areas.
d. many teenagers enjoys doing volunteering work in remote areas.
3. my mother/drive/carefully/my father
a. my mother drives so carefully as my father.
b. my mother drives carefullyier than my father.
c. my mother drives more carefully than my father.
d. my mother doesn't drive as carefully so my father.