Here are the correct answers for each blank:

112. **He might** **have avoided** the accident if he **had been** more careful.
**Answer: B)** have avoided / had been

113. **Hello, Ann! I** **haven't seen** you for ages. Where have you been all this time?
- I **came** back yesterday.
**Answer: B)** haven’t seen/have been/came

114. **What** **were** you **doing** at 6 p.m. yesterday?
- I **did** my homework. After I **did** it, I played chess with my friend.
**Answer: C)** were doing/ did/have done