Answer: B) Has / improved.
Explanation for this question is being written.
Answer: A) Have traveled.
Answer: B) Have
Answer: C) Have worked.
Answer: B) Has lost.
Answer: A) I Have known him for 5 years.
Answer: A) Has saved.
Answer: C) Has checked.
Answer: B) I have just cleaned your car.
Answer: B) Has remained.
Answer: A) I have finished my homework.
Answer: C) By using the full, complete form (e.g., 'has completed') instead of a contraction (e.g., 's completed').
Answer: B) Have known.
Answer: A) An action happened in the past and has connection to the present.
Answer: C) 5
Answer: C) Have studied.
Answer: A) I have been a student for five years.
Answer: B) Have seen.
Answer: B) Have / seen.
Answer: B) She has saved her money.
Answer: C) Have spent.
Answer: C) Has forgotten.
Answer: D) Have lived.
Answer: D) Have spoken.
Answer: B) Have worked / since.
Answer: C) Has managed.
Answer: A) Has just arrived.
Answer: B) Present Perfect.
Answer: D) Published/ has become.
Answer: A) Yes, I went there yesterday.
Answer: C) Have watched.
Answer: D) 's stopped.
Answer: D) Present perfect.
Answer: C) Has found.
Answer: A) They have not answered my question.
Answer: C) Has gone.
Answer: D) Have written.
Answer: C) Have finished.
Answer: D) I have finished my homework.
Answer: C) Lived
Answer: A) We last used K12 online application two months ago.
Answer: B) Present Perfect Tense.
Answer: D) Has done.
Answer: C) Have lost.
Answer: A) Have / arrived.
Answer: A) Has seen.
Answer: A) Bryan and Grace have been friends for six years.
Answer: B) Has earned.
Answer: B) Has cleaned.
Answer: A) Haven't driven.
Answer: C) Has already sent.
Answer: A) Has increased.
Answer: A) We have eaten toasts for breakfast.
Answer: B) Has just made.
Answer: A) Have read.
Answer: C) Has-broken
Answer: C) Written
Answer: A) Have been.
Answer: C) Has sent.
Answer: D) Have been.