6. Hoa said "I may visit my parents in the summer" 7. The teacher said "We can collect old book for the poor students" 8. She said "She doesn't buy this book" 9. The boys said "We have to try our best to win the match" 10. Her classmate said "Lan is the most intelligent girl in our class" 11.Lan said, "I will be very busy tomorrow." 12. Thu said. "All the students will have a meeting next Sunday." 13.Tam said. I can swim across this river." 14.His sister said. "I don't buy this book." 15. The boys said. "We have to try our best to win the match." 16. Her father said to her. "You can go to the movie with your friends." 17.Her classmate said. "Lan is the most intelligent girl in our class."