IV. Give the correct form of the words. 16. There are lots of __________ (beauty) beaches in Viet Nam. 17. Air __________ (pollute) is a big problem in the big cities. 18. Spring is __________ (warm) than Fall. But Summer is the __________ (hot) season of a year. 19. His (tooth) __________ are small and white. 20. I go to visit my grandparents (one) __________ a month.

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