Chia động từ trong ngoặc ở thì quá khứ hoàn thành

I. Chia động từ trong ngoặc ở thì quá khứ hoàn thành.
1. The storm destroyed the sandcastle that we..................(build) .
2. He ...................(not / be) to Cape Town before 1997.
3. When she went out to play, she ...................(do / already)her homework.
4. My brother ate all of the cake that our mum......................(make) .
5. The doctor took off the plaster that he.................. (put on) six weeks before.
6. The waiter brought a drink that I ....................(not / order) .
7. I could not remember the poem we................... (learn) the week before.
8. The children collected the chestnuts that ....................(fall) from the tree.
9. ......................(he / phone) Angie before he went to see her in London?
10. She .....................(not / ride) a horse before that day.