It has been widely accepted that dinosaurs died out because of       1     unexpected incident. But wildlife today     2    (disappear) or is in danger just because humans do harm to it. For example, tigers are hunted for fur to make carpets; grassland     3    (destroy) without mercy(怜悯) so that a lot of animals can only live in secure reserves.

Last year, scientists saw some monkeys making use of a certain kind of insects to protect themselves     4    fierce mosquitoes. After a careful study, scientists found that the insects contain a     5    (power) drug. Then local farmers were employed     6    (catch) the insects to make medicine. The result was     7     the insects disappeared from the whole area.When the farmers were told that it was a loss to humans they burst into laughter and responded, “ The real loss is     8    (we) decreasing income.”

We should appreciate the natural balance and pay more attention to the     9    (important) of wildlife protection. Not until we succeed in     10    (let) wildlife live in peace, can we smile in relief.

The Chinese have created some of the greatest inventions in the world. They came up with a way to make modern paper thousands of years ago. The first paper     1     (invent) was made from worm fishing nets, bark of the mulberry tree, and cloth. These materials were found     2     (easy), which meant that large amounts of paper were cheaper to make. As paper became more affordable, it was used for writing on. During the Tang Dynasty, it was made into paper bags and used to preserve the flavour of tea. Today, paper     3     (use) for many different purposes around the world.

Researchers have long expected to use tiny flying robots to do important tasks. However, fitting the heavy electronics required to power and control the wings into the tiny robots has been     1     (challenge). Now, there is hope, thanks to RoboBee X-Wing the world's lightest aerial vehicle (飞行器) that can fly without relying     2    a heavy power source.

    3    (show) by Harvard researchers, the insect-inspired robot is controlled by muscle-like plates. Six small solar cells provide the power. To test its flying capabilities,     4     team put the RoboBee X-Wing's solar cells in a     5    (combine) of halogen (卤素) and LED lighting. The tiny robot's wings began to flap, and it rose. The flight lasted for about half a second.    6     it was not completely successful, its unassisted flight     7     (consider) as a huge milestone for the future of tiny flying robots.

Of course, we draw lessons from the test: The robot has no navigation capabilities and, more     8    (important), it requires light three times brighter    9    the sun to work. Additionally, it is not equipped to stand even a slight breeze, let alone the strong wind it is likely to meet as it goes about performing important tasks.

The Harvard researchers are not the only scientists trying to create flying robots. Other researchers also hope to experiment with other power sources and to add more advanced "brains" and sensor systems that will enable future flying robots    10     (accomplish) tasks independently.

The 500-meter Aperture Spherical Radio Telescope（FAST）, also known as China's Tianyan or "Sky Eye", has     1    （official）opened to global scientists since April, 2021.

As we know, radio telescopes    2    （design）to "listen" or "receive" signals emitted from the universe. With specialized antennas（天线）and radio receivers, these telescopes can detect radio waves from stars, galaxies and black holes. The data collected in turn help scientists    3    （good）explore the universe. It will also be used occasionally to search for alien life.

The giant radio telescope will also help find more pulsars（脉冲星）, which send out steady signals and waves in a regular rhythm. Scientists use pulsars    4    （study）the extreme states of matter, measure cosmic（宇宙的）distances and track time in an ultra-precise（超精密）way. So far, it    5    （discover）more than 240 pulsars.

    6    （locate）in southwest China' s Guizhou Province,    7    largest single-dish radio telescope of the world was completed in 2016. It was put to use    8    January 11, 2020. FAST is now the only "Sky Eye"    9    humans can use to observe cosmic waves. It has immense potential to detect fast radio bursts and gravitational waves,     10    （provide）data support for research into the physical process of the Big Bang, according to experts at the NAO.

With the development of AI technology, the dream that you stay in bed and press a button to send a robot to do all the work may     1    (actual) come true.     2     is known to all, to achieve the aims of being capable of learning from experience, adjusting to new inputs and     3    (perform) tasks like humans, many approaches to     4    (create) true AI have been put forward, including “deep learning”,     5     has the capacity of analysing massive amounts of data through multiple layers, imitating the complex works of the human brain. Nowadays, AI has an unlimited number of     6    (apply) in many fields: finance, health care, machine and art, etc. All in all, this technology was a double sword. It changed our way of life, but we also should pay attention     7     some warnings while     8    (enjoy) its convenience.     9     is our duty to make good use of the technology. And we believe tomorrow will be     10    (good).

Natural cloning has taken place for generations. An example of this is identical     1     (twin). A sheep called Dolly was the first mammal to be cloned     2     (success). Since Dolly, more than 20 mammal species     3     (clone)including camels and goats. In 2018, China announced that two monkeys had been cloned. In     4     (compare)with other species, scientists have had to work hard to break the technical barrier to get primates with     5     (edit)genes. Scientists say that major breakthrough offers the potential     6     (create)monkeys with     7       (identity)genes to give more accurate research results and perhaps lead to cures     8     various diseases. While scientists insist     9     is crucial to continue research, others raise more concerns and worry that the technology might     10     (abuse)by some organisations.