1. The discovery of a ---- cancer-causing chemical in foods like crisps, chips and cereals caused shock waves around the world when it hit the headlines earlier this year.

2. Each year, large amounts of carbon monoxide are ---- into the atmosphere by automobiles and factories.

3. A fresh look at the final months of the presidency of John F. Kennedy ---- that a second Kennedy term might have
produced a rapprochement with Cuba.

4. Sometimes a seemingly modest business deal can change the whole ---- of an industry.

5. He admitted that he was resigning from the post because he felt it did not make sufficient call on the combative and ---- elements of his nature.