3-c, 4-a, 5-d. 6-a: carve => carved
1.because i was too tired ,i went home early
2.because i was very sick , i did not come to class yesterday
3.because i had no food at home , i went shopping
4.because i had an appoitment ,i came to class late
5.because i like learning english ,i come to class
6.because my friend will get married next week, iwill go to sydney
7.because i want to find a job, i need to learn english
8.because my son is too young , he cant not drive a car