(13-16) Use the correct tense or form of the verbs in parentheses:
13. Ao dai used to ________ in our school many years ago. (wear)
14. How about ____________ exhaust fume ? (reduce)
15. I don't like ___________ like that. (follow)
16. We should practice ___________ English in class regularly. (speak)
(17-22) Use the correct form of the words in parentheses:
17. Loan is not satisfied with her ______________ for Christmas. (prepare)
18. How can we reduce water ____________? (polute)
19. We often go _______________ on the weekends. (picnic)
20. I had a most __________________ experience this morning. (please)
21. What would be the most effective means of ____ our products? ( advertise )
22. TV ____________ children to see how people around the world live and think. (able)