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 31. If I _____________ where she lived, I would go and see her. A. know B. knows C. to know D. knew 32. We need to be more _____________ about this problem. A. scientific B. majestic C. domestic D. alphabetic 33. The election campaign has been focused mainly on _____________ issues. A. dialectical B. energetic C. domestic D. conical 34. If I _____________ the lottery, I would be a millionaire. A. win B. wins C. winning D. won 35. I will discuss that problem with him if I _____________ him tomorrow. A. see B. sees C. to see D. seeing 36. If I knew Chinese, I _____________ for job in China. A. will apply B. would apply C. will be applied D. would be applied 37. She was unable to find a _____________ job. A. important B. importantly C. permanent D. permanently 38. Any company found to be breaking these rules will be heavily _____________. A. fined B. done C. made D. got 39. These figures are for _____________ purposes only. A. illustrate B. illustrating C. illustrative D. illustration 40. I would go jogging with Mark if he _____________ here today. A. is B. will be C. were D. would be 41. Many species of wildlife are becoming extinct, _____________ the rainforests are being destroyed. A. therefore B. since C. consequently D. so 42. Hemp can be used to make paper, _____________ it could reduce the need for logging. A. consequently B. due to C. so D. since 43. _____________ logging provides jobs and profits, the government is reluctant to control it. A . So B. Consequently C. Since D. Due to 44. Hemp was grown throughout history_____________ its versatility; it can be used to make many different things. A. due to B. because C. since D. as a result 45. Hemp is related to the marijuana plant; _____________ it is illegal in many countries. A. so B. due to C. as a result D. because 46. The polluted chemical waste was dumped into the ocean; _____________,the mass of fish died. A. because B. as C. because of D. consequently 47. It was guessed that the fish died_____________ a powerful toxin in the sea water. A. because of B. because C. since D. as a result 48. Many species in BC are threatened _____________ logging. A. so B. because C. since D. due to 49. Smoking can_____________ heart disease. A. lead to B. create C. causes D. due to 50. Radioactive pollution is increasing _____________ the increased use of radioactivity. A. as B. since C. because of D. because