it would be a. I don't know right now...
Answer:
1. EFFECT
a. Modern Western medicine can have unpleasant side <u>effects.</u>
b. In China, acupuncture has been found to be <u>effective</u> for centuries.
2. SUCEED
a. Biofeedback methods have been <u>successful </u> in treating headache and muscle pain.
b. The vaccine has been working <u>successfully</u> for the last ten years.
3. PROVE
a. There is little <u>proof</u> that reflexology works.
b. It is difficult to <u>prove</u> how herbal medicine cures illnesses.
