Answer keys of exercises of past perfect

Fill in the gaps using the past simple or the past perfect

(Hãy điền vào chỗ trống bằng quá khứ đơn hay quá khứ hoàn thành)

1. He (be) was/ had been a waiter before he (become)            became          a manager.
2. I (feel)  felt       a little better after I (take) took/ had taken      the medicine.
3. I was late. The teacher (give, already) had already given     a test when I (get) got to class.
4. They (leave)    left       the village when they (collect) collected/ had collected enough data.
5. By the time class (be) was     over, the rain (stop)     had stopped    .
6. Class (begin, already) had already begun     by the time I (get)        got       there, so I (take, quietly)            quietly took      a seat in the back.
7. Dinosaurs (become)   had become    extinct by the time human kind (appear)         appeared         .
8. I (see, never)   had never seen           any of Picasso’s paintings before I (visit) visited the art museum.
9. I almost missed my plane. All of the other passengers (board, already)       had already boarded   by the time I (get)   got       there.
10. Yesterday at a restaurant, I (see)       saw      an old friend of mine. I (see,not) had not seen          her in years. At first, I (recognize, not) did not recognize     her because she (lose)           had lost  at least 20 kilos.

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