Scientists say they have found key clues into how long we will live. One of them is a【C1】______handshake. British researchers believe a strong grip is not just a sign of confidence but also an【C2】______of longevity. Lead author Dr. Rachel Cooper, of University College London, said her study looked into 33 different reports on the strength of handshakes. The research【C3】______more than 50, 000 men and women and spanned 40 years. Dr. Cooper concluded that those with weaker handshakes were 70 per cent more likely to die earlier than those with the strongest handshakes. She concludes that people with strong grips may have benefited【C4】______a happy childhood that included a healthy diet and plenty of exercise. The new study,【C5】______in the British Medical Journal, also found other signs of living a longer life. These "measures of physical capability" include walking at a faster【C6】______, getting out of a chair quickly, and being able to balance on one leg. The study showed that slow walkers were almost three times【C7】______to die earlier than those who【C8】______out of their chairs. Dr. Cooper believes there needs to be more【C9】______into the link between physical capability and longevity. " Research that helps people to enjoy a long and healthy life is ever more important to help【C10】______an ageing population," she said.