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Stock investors have been stuck on a never-ending rollercoaster this year. Steep drops and fast gains have returned these anxiety-addled passengers back to where they started.

After losing 37% in last year's bloodbath, the S&P 500 Index shed another 25% before hitting a 52-week low on March 9. The index has since climbed 31%. For all its gyrations, the benchmark is down just 1.2% this year.

The only way investors can win in this market is by picking promising stocks from the most stable industries. While technology companies have been leading the market this year, stocks in health care, media and utilities offer some of the best investment opportunities this summer.

Health care: Investors have been questioning for months whether President Barack Obama's reform plans will hurt the profits of insurance and drug companies. These fears have been dragging down stocks across the industry, creating bargains among quality companies.

While big ideas have been discussed, Congress is more likely to pass a more moderate plan. Demand for health-care products and services will also grow as the population ages. These drug companies offer healthy profit potential with low risk.

Teva Pharmaceutical Industries ( TEVA): Teva is the world's largest producer of generic drugs, a niche marked by low research, development and marketing costs. These are some of the biggest expenses for name-brand drug companies.

Teva has an added advantage in that most pharmacies dispense generic drugs over name-brand ones, ensuring a reliable market. The stock is up 16% this year and analysts estimate that second-quarter profit rose more than 19%, suggesting there's more room to gain.

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