Ex7: 1. The tornado destroyed the tent that we (build) ____________. 2. She (not / be) ____________ to Hanoi before 2018. 3. When he went out to play, he (do / already) ____________ his homework. 4. My sister ate all of the cake that our mum (make) ____________ . 5. The nurse took off the plaster that she (put on) ____________ six weeks before. 6. The waitress brought a drink that I (not / order) ____________ . 7. I could not remember the song we (learn) ____________ three week before. 8. The children collected mangos that (fall) ____________ from the tree. 9. (she / phone) ____________ Nam before she went to see him in Laos? 10. He (not / ride) ____________ a elephants before that day.