Answer: A) Can't
Explanation for this question is being written.
Answer: C) Were able.
Answer: D) Modal verb.
Answer: A) Do
Answer: A) Could
Answer: B) Cannot / can't.
Answer: D) Could
Answer: A) They couldn't solve the equation $x^2 + 2x = 0$.
Answer: A) Could-can't
Answer: C) Can
Answer: A) She can't be Andy's mother.
Answer: A) Can be.
Answer: A) Can
Answer: D) Can't
Answer: C) Can't
Answer: B) Can
Answer: B) Couldn't
Answer: A) TRUE
Answer: B) He can sing.
Answer: D) Draw
Answer: B) Can't
Answer: B) I could play the piano when I was younger.
Answer: C) Could
Answer: A) Both can /are able to.
Answer: B) We couldn't visit John at school.
Answer: D) Can
Answer: C) Could speak.
Answer: B) Can / Cannot.
Answer: A) Couldn't
Answer: D) Couldn't
Answer: C) Couldn't
Answer: A) Will be able to.
Answer: B) Hardly
Answer: B) Could / can.
Answer: B) Can't hear.
Answer: B) We can go to visit them.
Answer: B) Cannot
Answer: B) Play