Answer: A) Could have.
Explanation for this question is being written.
Answer: C) Could have been doing.
Answer: D) Could have.
Answer: A) Could have taken.
Answer: D) Could have eaten.
Answer: B) Could
Answer: A) COULD HAVE PHONED.
Answer: D) Could have injured.
Answer: B) Could have.
Answer: D) Could have helped.
Answer: B) Could have offered us a lift!
Answer: D) Couldn't have cleaned it.
Answer: A) Correct
Answer: C) We could have bought the tickets earlier.
Answer: A) A
Answer: C) Could have.
Answer: B) Couldn't have.
Answer: A) Could
Answer: B) We could have learnt better.
Answer: D) Couldn't have been.
Answer: C) Couldn't have won.
Answer: A) I suppose they could have got caught in traffic.
Answer: C) Were to visit.
Answer: B) Couldn't have eaten.
Answer: A) Would have be.
Answer: B) Conjecturing a certain possibility in the past.
Answer: A) Couldn't have seen.
Answer: C) Could have prevented.
Answer: B) Could have helped.
Answer: D) Of
Answer: D) Have been working.
Answer: B) Could achieve / had worked.
Answer: C) Could
Answer: D) Could
Answer: C) I wouldn't have answered.
Answer: A) Could not have stolen.
Answer: C) I and 2 are both possible.
Answer: B) She could of finished her project.
Answer: C) Could have stayed.
Answer: B) Decide
Answer: B) Both are correct.
Answer: D) Could have had.
Answer: C) Could have taken.
Answer: D) Could stay.
Answer: C) The implication of 'could have' is that there was a potential for assistance, but it was not actualized.
Answer: D) Could have been.
Answer: C) Blaming the listener.