activity [ækˋtɪvətɪ] n. 活動
My favorite outdoor activity has always been biking.
我最喜歡的戶外活動一直是騎單車。
respond [rɪˋspɑnd] v. 回覆；回應
I went to the house and knocked on the door, but no one responded.
我去了那間房子敲門，但沒有人回應。