1. Sentence 1: Doctors in the field of
preventive medicine concentrate on
preventing disease and to encourage
good health practices.
Which of the following is the best way to
write the underlined portion of this
sentence? If you think the original is the
best way, choose option (1).
(1) preventing disease and to encourage
(2) prevent disease and to encourage
(3) to prevent disease and to encourage
(4) preventing disease and encouraging
(5) prevent disease and encourage
