Read the following passage, and mark the letter (A, B, C or D) on your answer sheet to indicate the correct word (s) for each of the blanks.
From the seeds themselves to the machinery, fertilizers and pesticides –The Green Revolution regimen depends heavily on technology. One (4)_____, however , depends much(5)_________on technology – organic farming . Many organic farmers use machinery, but (6)_____chemical fertilizers or pesticides .(7)______chemical soil enriches , they use animal manure and plant part not used as food – natural , organic fertilizers that are clearly a renewable (8)_____.Organic farmers also use alternatives (9)_____pesticides ; for example they many rely on natural predators of certain insect pets.(10)___ the need arises ; they can buy the eggs and larvae of these natural predators and introduce them into their crop fields . They use(11)_____techniques to control pests as well , like planting certain crops together because one crop repels the other’s pests . Organic farmers do not need a lot of land ; (12)_____, organic farming is perfectly (13)_____to small farm and is relatively inexpensive .Finally , many organic farmers’ average yields compare favorably with other farmers’ yields.
Trả lời câu hỏi dưới đây:
__________(10)
Nghĩa câu: ..... the need arises ; they can buy the eggs and larvae of these natural predators and introduce them into their crop fields (.... nhu cầu phát sinh; họ có thể mua trứng và ấu trùng của các loài ăn thịt tự nhiên và giới thiệu chúng vào lĩnh vực trồng trọt)
=> Đáp án phù hợp nhất là A. if ( nếu ). Nghĩa các liên từ còn lại: though: mặc dù; because: bởi vì; then: sau đó