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51. We must take action to protect the environment; otherwise, it will be too late to save our plan
A. It will be too late to save our planet if we take action to protect the environment.
B. If we take action to protect the environment, it will be soon to save our planet.
C. It won't be too late to save the Earth if we don't take action to protect our planet
D. If we don't take action to protect the environment, it will be too late to save our planet.
52. One of the biggest benefits of solar energy is that it doesn't cause pollution.
A. It is great to use solar energy because of no pollution.
B. It is beneficial using solar energy because it isn't polluted.
C. It is beneficial to use solar energy because it doesn't cause pollution.
D. Solar energy is beneficial because of its unpolluted.
53. Acid rain has terrible impacts on both the environment and our health.
A. Acid rain harms the environment or the health of people.
B. Acid rain causes harm to not only the environment but also our health.
C. Acid rain is not harmful to the environment as well as the health of people.
D. Acid rain has positive impacts on the environment and our health.
54. We should bring our own water bottles and shopping bags
A. in order to reduce plastic trash
B. so that reduce plastic trash
D. if we have no plastic trash
C. in hope that no plastic trash
55. Global warming is getting worse
A. because greenhouse gases from factories, vehicles and other human activities
B. despite greenhouse gases from factories, vehicles and other human activities
C. due to greenhouse gases from factories, vehicles and other human activities
D. thanks for greenhouse gases from factories, vehicles and other human activities