As heart disease (0) is continuing (continue) to be the number one killer in the United States, researchers (i) …………. (become) increasingly (ii) …………. (interest) in identifying the potential risk factors that (iii) …………. (trigger) heart attacks. High-fat diets and ‘life in the fast lane’ have long (iv) …………. (know) to contribute to the high incidence of heart failure. Heart failures (v) …………. (appear) to have seasonal and temporal patterns. Many heart failures (vi) …………. (occur) in cold weather and many people (vii) …………. (experience) heart failure on Monday than on any other day of the week. Cardiologists (viii) …………. (observe) more morning phenomena of heart attacks than in afternoons or evenings.
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