I had to label the subject and the verb:

The eyes or the skin (is, are) often adversely affected by a lack of Vitamin A.
S: skin
V: is

Neither bleach nor dyes really (help, helps) unhealthy hair look better.
S: Neither
V: help

Ripe tomatoes, leafy Brussel sprouts, and a handy orange (is, are) rich in Vitamin C.
S: orange
V: is

Unfortunately for the sedentary, neither diet nor vitamins (provide, provides) sufficient fuel for good health.
S: vitamins
V: provide

In the Peace Corps, an American group (goes, go) into an underprivileged country to help the people develop skills.
S: group
V: goes

The family members (learns, learn) a variety of different skills that are valuable in the market.
S: members
V: learn

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Filed under: Diet Fuel

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