Many athletes have been told that smiling while     1    (sweat) will make our efforts feel easier. A marathon runner smiled widely through the final miles of his fastest-ever marathon; afterward, he said what he had hoped     2    (be) that the smiling would ease him to the finish line; But there has been little solid scientific evidence to support this idea. In recent years several past studies     3    (examine) whether deliberately smiling can make changes to how people feel psychologically during races,     4     few have looked at the physical effect     5     sports performance.

Researchers decided     6    (gather) a group of experienced recreational runners and have them alternatively smile broadly as they ran. Many of the runners found it difficult to smile throughout the whole session, though. Their smiles became     7    (increase) fixed and unnatural. Such false smiles make     8    (few) facial muscles (肌肉) start working than the sincere version and most likely result in less     9    (relax) and performance improvement. So the key to using a happy smile to make you     10     better runner may be to smile sincerely and often near a race’s end, but in 30-second bursts, rather than constantly.

Louis Cha, better known by his pen name Jin Yong, was a Chinese wuxia novelist and essayist,     1    co-founded the Hong Kong daily newspaper Ming Bao in 1959 and     2     (serve) as the first editor-in-chief. He was Hong Kong’s most famous writer.

His wuxia novels have     3     widespread following in Chinese communities worldwide. His 15 works     4     (write) between 1955 and 1972 earned him a reputation as one of the greatest and most popular wuxia writers ever. By the time of his     5     (die) he was the best-selling Chinese author, and over 100 million copies of his works have been sold worldwide. His works have the unusual ability     6     (go) beyond geographical and ideological barriers separating Chinese communities of the world, achieving     7     (great) success than any other contemporary writer.

Most of his works     8     (translate) into many languages so far, including English, French, etc. Even the asteroid (小行星) 10930 Jinyong (1998 CR2) is named     9     him.We cannot thank him more for     10     he has done in novel literature.

Global warming could make humans shorter.Scientists claim to have found evidence that it caused the world's first horses     1     (become) smaller nearly 50 million years ago.In fact，a team from the universities of Florida and Nebraska says,     2     has found a link between the earth heating up and the size of horses，during the last time the world heated up.The scientists used fossils to follow the evolution of horses from their earliest     3     (appear)56 million years ago.As temperatures went up，their size went     4    . The scientists say that the current warming could have the same effect     5     mammals and could even make humans     6    (small)．“Horses started out small，about the size of a small dog.What's     7    (surprise) is that after they first appeared，they then became even smaller and then dramatically increased in size，and that     8     (exact)corresponds to(符合)the global warming event，followed by cooling.”“It had been known that mammals     9     (be) small during the last warm time，    10     we hadn't realised that temperature specifically was driving the evolution of body size，”Dr Bloch said in the Science journal.

Up to 82 percent of children with healthy mothers are not easy to be obese（肥胖的）, according to research. A mother,     1     has a healthy weight, exercises regularly, eats a healthy diet, doesn’t smoke and only     2    (drink) wine in moderation, is significantly less likely     3    (have)a fat child, scientists say.

And research suggests it could be more to do with nurture(养育)    4     nature, as a mother's lifestyle appears     5    (direct) linked to the health of her child. When both mother and child follow a healthy lifestyle, the risk of obesity     6    (reduce)even more, the study of more than 24,000 children found.

The study examined the medical history and lifestyles of more than 24,000 children aged nine     7     fourteen, born to almost 17,000 women in the US. Researchers looked at the link between overall mother health and likelihood of a child     8    (be) obese.

The mother's health was judged on her height-to-weight ratio(比例), her diet, amount of physical     9    (active), smoking status and how much alcohol she drank. A healthy weight and diet, regular exercise, no smoking and moderate drinking all reduce the chance of a woman having     10     obese child.