III. Chia động từ theo thì qúa khứ hoàn thành. (Supply the correct form of the verbs in the past perfect.) 1. Before I came home, I _______ (buy) some bread. 2. When we reached the theatre, the show _______ (already, start). 3. Cindy remembered that she _______ (meet) that man somewhere. 4. She _______ (never, send) me a message before last month. 5. I tried riding an elephant last week. I _______ (not, ride) it before. 6. Mary didn’t come to the club yesterday because she _______ (be) ill. 7. My sister _______ (never, eat) snails before trying them last night. 8.Why _______ (he, choose) a first-aid-kit box instead of a vest life? 9. Jane was unhappy because she _______ (lose) her new mobile phone. 10. John had to go home because he _______ (not, close) the door.