Subject/Verb Agreement

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The use of vitamin supplements and herbs (be) ___ becoming increasingly popular among Americans.
While many studies claim that vitamins and herbs can improve health, there (be) ___ a lot of controversy about their safety.
The Food and Drug Administration (FDA) (do) ___ not regulate vitamins and herbs.
Most experts (believe) ___ that herbal supplements are mild and somewhat harmless.
Still, anyone who (take) ___ too much of a vitamin or herb could suffer negative side effects.
For example, some medical problems (have) ___ been linked to overuse of ephedra, an herb taken by people to lose weight.
Some research (suggest) ___ that Vitamin C may help prevent cancer.
People who (take) ___ more than 1,000 miligrams of vitamin C daily may experience diarrhea or kidney stones.
Advertisers say that the herb "kava kava" (reduce) ___ anxiety and insomnia.
Using large amounts of kava kava (be) ___ not wise as muscle, eye or skin problems could result.
The danger of long-term use of vitamins and herbs (be) ___ still unknown.
There (be) ___ a lot of evidence that vitamin-rich foods are beneficial.
However, whether the use of supplements (be) ___ helpful or not is still being debated.
Most people (be) ___ able to get all the vitamins they need in the foods they eat.
A daily diet that (contain) ___ foods from the 4 groups should supply all the nutrients a person needs.
Eating 5 servings of fruits and vegetables daily (be) ___ said to provide all the essential vitamins we require.
The best way to get the necessary vitamins and minerals (be) ___ naturally, through a healthy diet.
Talking to your doctor before taking supplements (be) ___ advisable.