Điền từ thích hợp vào chỗ trống

55. This river is extremely __________. (pollute)
56. A __________ faucet may waste 500 liters of water a month. (drip)
57. Her appearance is __________ today. (need)
58. Farm __________ are always exported. (produce)
59. This plant’s __________ is high, so it attracts a lot of investment. (produce)