Choose the most suitable one to complete each sentence. Change the form where necessary.comparison enhance formulation immune minimal distinct option relieve retain stock undergo1. These people in the coal mine factory had no ________ but to take the low-paid unattractive work.2. Hopefully, the multi-national anti-terrorist conference will ________ the prospects of world peace.3. There's a lot of evidence that oily fish, as ________ from fatty meat, has a beneficial effect.4. Before testing any new ________ of medicine on children, the doctors have to make very hard judgments about the benefits and risks.5. Since only a tiny amount of radiation has been released, the World Health Organization believes that the relevant public health risk is ________.6. The cancer patient must first ________ radiation and chemotherapy (化疗) to weaken the original immune system, which is an exhausting experience.7. His business has been taken over by a big corporation, but he still ________ some control over it.8. HIV (艾滋病毒) is not to undermine one human body organ, but to destroy the body's ________ system, resulting in multiple organ damage.9. To be on the safe side, some families tend to ________ their cellars with food and water in case of emergency.10. Measures have been taken to ________ the city of its traffic jam, but the problem is not likely to be solved in a short time.11. Let's try a ________ — reducing the sun to the size of a golf ball, the earth would be the size of a grain of sand.

The words in the box below are either active words or academic words marked in the Academic Word List (AWL). Choose the most suitable one to complete each sentence. Change the form where necessary. comparison enhance formulation immune minimal distinct option relieve retain stock undergo 1. These people in the coal mine factory had no ________ but to take the low-paid unattractive work. 2. Hopefully, the multi-national anti-terrorist conference will ________ the prospects of world peace. 3. There's a lot of evidence that oily fish, as ________ from fatty meat, has a beneficial effect. 4. Before testing any new ________ of medicine on children, the doctors have to make very hard judgments about the benefits and risks. 5. Since only a tiny amount of radiation has been released, the World Health Organization believes that the relevant public health risk is ________. 6. The cancer patient must first ________ radiation and chemotherapy (化疗) to weaken the original immune system, which is an exhausting experience. 7. His business has been taken over by a big corporation, but he still ________ some control over it. 8. HIV (艾滋病毒) is not to undermine one human body organ, but to destroy the body's ________ system, resulting in multiple organ damage. 9. To be on the safe side, some families tend to ________ their cellars with food and water in case of emergency. 10. Measures have been taken to ________ the city of its traffic jam, but the problem is not likely to be solved in a short time. 11. Let's try a ________ — reducing the sun to the size of a golf ball, the earth would be the size of a grain of sand.