If you could choose, when would you get up in the morning? When is the     1     time of day for you to solve a difficult problem? If you prefer sleeping late and working late, you are an owl (猫头鹰). If you like to get up early in the morning and     2     to have the most energy (精力) early in the day, you are a lark (百灵鸟).

About 10 people out of 100 are larks.     3     body clocks are set early. They get out of bed early in the morning and usually don’t need to     4     to work. They think better and work better early in the day.     5     morning is the best time for them to get their work done.     6     late afternoon, larks begin to grow tired and they like to go to bed early. Owls prefer sleeping late. About 20 people out of 100 are owl, energy peaks (高峰) come in the afternoon     7     at night. The later it gets, the better they seem to feel. They get higher grades on tests in the afternoon than they do in the morning. The     8     is true for larks.

Most people are neither complete larks nor complete owls. They are     9     in between. They don’t have much     10     getting up a little earlier or staying up a little later if they have to.

There are some hobbies and sports, such as cycling and playing soccer, which are always trendy (流行的), while others go up and down on popularity. Skateboarding,     1    , was born in the US in the 1950s and was the height of fashion in the early 1960s. But later its popularity     2    . In the mid-1970s, a new improved board design     3     and young people took an interest in it again. One sport that is very popular in the UK now is “stunt scooting (特技滑板)”. Young people of all ages, especially boys, are     4    . While stunt scooters sell at around $ 100, fans often spend as much again making them more colorful and beautiful.

“The great thing about scooting is that you can do it anywhere,” says Jack Yeomans, who spends most of his spare time stunt scooting with his friends. “You can just skate in the streets and lots of     5     skate training places where you can watch great players in action. Many of these have foam pits (泡沫坑) so you can practice new stunts without     6     yourself?”

There are many stunts to learn, from     7     jumping to turning the scooter around while in the air, 360-degree turns, and even front and back flips off high slopes (斜坡).

In addition to performing stunts, fans also enjoy putting some of their best     8     and their worst fails on films. Their stunt movies are usually made onto the Internet.

When the steam engine (蒸汽机) was     1     in the 18th century, it began one of the greatest revolutions (革命) that had ever     2     in our world. The invention of the petrol engine (内燃机) at the end of the 19th century led other great     3     in our lives. And the computers is an invention     4     important than these engines     5     . Just as there was a Stone Age (石器时代), an Iron Age (铁器时代) and so on, we have been     6     for centuries in a Paper Age. And almost all information was     7     and sent on paper, and so much of it is wasted after it has been used     8     that a large number of trees have to be     9     down every year to make paper. But now, with the computer, a lot of information can be stored and sent     10     any paper at all, using small discs (碟片) or magnetic tapes.