Read It! Malaria is a dangerous disease in many parts of the world. The illness has become more serious in recent years. Scientists are trying to fight malaria by developing a new vaccine, or drug remedy. If successful, it will prevent people from catching the disease. However, to test the vaccine, volunteers will have to be exposed to malaria. Scientists will ensure that volunteers are safe. The volunteers will be watched closely. Even if the vaccine fails to work, they will get no sicker than they would get with the flu. The volunteers will get medical treatment before the malaria worsens.

Do It!

The scientists are being .

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A impatient
B thrifty
C cautious
D modest