I. Choose the best answer to complete each of the following sentences. 21. All the aquatic plants and animals will die if the factory_____________ dumping poison into the lake. A. will keep B. to keep C. kept D. keeps 22. A lot of fish has died recently because of the _____________ water in this lake. A. contaminating B. contaminated C. contaminate D. contaminant 23. If the air was clean, we _____________ have to wear masks when going out. A. wouldn’t B. won’t C. would D. will 24. If I _____________ you, I _____________ water from that dirty tap. A. am - will drink B. am - won’t drink C. were - would drink D. were - wouldn’t drink 25. If he _____________ trash around his garden, the garden would look very nice now. A. will throw B. would throw C. didn’t throw D. doesn’t throw 26. Price and availability are the _____________ factors that will determine product success. A. critical B. musical C. physical D. medical 27. If it rains, we _____________ the match. A. cancel B. will cancel C. cancelled D. cancelling 28. If I were a tree, I _____________ the rain. A. love B. loved C. will love D. would love 29. The decor inside the house was very_____________. A. fantastic B. electric C. mechanic D. artistic 30. If she _____________ late, we will go without her. A. am B. is C. was D. were