a)
1. she wanted her room to look nice at the festival
2. Mr Robinson said they were going to the rice- cooking contest
3. Tam's father said I had to take at least two bottles of water
4. Trung said he would clean all the class windows
5. Mai asked Ma to help her hang that picture
b)
1. The bill has to be paied before the first of the month
2. The box has been locked and I can't open it
3. All the dinner had been eaten before they finshed the conversation
4. Was you made to laugh a lot by the clowm last night?
5. A sad song was heard by me