State whether the verbs in the following sentences are used transitively or intransitively.
1. Heat expands metals. __________________
2. Metals expand on heating._____________________
3. The driver stopped the car. ______________________
4. The car stopped abruptly. __________________________
5. You must speak the truth. ___________________________
6. You must speak loudly. ______________________________
7. The boy is flying the kite. _________________________________
8. The birds are flying in the sky. _____________________________
9. The rider fell off the horse and broke his arm. __________________
10. The woodcutter felled a huge tree. _______________________
11. The explosion sank the ship. ______________________________
12. The ship sank suddenly. ______________________________