25. Please buy some _________ (toothbrush) for them.

24. Today is Sunday. Let's go ________ (skate).

23. I can do my homework by _________ (I).

22. There is a tall _________ (build) in front of the post office.

21. She wants to be a _________ (science) when she grows up.

20. Their lives will be a lot b　　　　　 　than it is now.

19. The other students kept their eyes c　　　　　　　 　right away.

18. Do you have a c　　　　　　 　card?

17. We will have a long v 　　　　　　after a few days.

16. There will be less p　　　　　　 　in 100 years.