用方框中所给动词的适当形式完成下列句子 1. I _____ my teeth three times yesterday. 2. When I was a child, I _____ to be a doctor. 3. We _____ our vacation last year. We stayed at a very nice hotel. 4. Amy's grandfather _____ when he was 90 years old. 5. The concert _____ at 7:30 and ended at 10:00.