25. We all think light is the second ____________(use) invention.

24. They want to learn how to eat ____________(health).

23. The boy’s parents were very ___________(thank) to the policeman because of his help.

22. Of all the singers, she sings ____________(beautiful).

21. When the child saw a big dog, he was too ___________ (frighten) to move.

20. You must drive as _______________________________________(safe) as possible

19. The house caught a fire. The wounded man was carried to　　　　　 . (safe)

18. I think traveling by train is _______________________(enjoy) than traveling by car.

17. There are lots of ______________________________(colour) clothes in the market.

16. Edison was a great 　　　　　. During his life he had many 　　　　　.(invent)