1. Nam said that he wanted to become a scientist when he grew up
2. Peter said that they had met Professor stephen Marshall the previous day
3. Hoa said that she could not go to the science class the following morning
4. She told us that they had studied that kind of plant for two months
5. Mr. Vinh said that they dỉdrít open the laboratory that day
6. Nick said that he was tinding evidence for his research then