Answer: A) He is able to solve any mathematical problem.
Explanation for this question is being written.
Answer: A) I don't think I can go.
Answer: B) Were you able to stop the mugger?
Answer: A) Could
Answer: C) Can't
Answer: B) COULD
Answer: B) Can't
Answer: C) Could
Answer: A) Can't
Answer: C) Can
Answer: A) Ability
Answer: C) Ability
Answer: D) All the options are correct.
Answer: A) TRUE
Answer: B) She can speak three languages.
Answer: A) Can
Answer: B) Couldn't
Answer: C) Couldn't
Answer: C) Both
Answer: C) In the past.
Answer: A) To express ability, possibility, or permission.
Answer: B) Will be able to / won't be able to.
Answer: A) Could make.
Answer: B) Was able to.
Answer: C) Accidents can happen even to the most careful drivers.
Answer: A) Could / Would.
Answer: C) Was able to.
Answer: B) Knew
Answer: B) Her husband can't speak any words in English.
Answer: B) Could
Answer: D) Can't they.
Answer: B) Could do.
Answer: A) It can't be easy to work for your in-laws.
Answer: A) It can get very cold in winter.
Answer: D) Were able to.
Answer: B) Can
Answer: B) Verb base form.