No one knows exactly how the earth began, as it happened so long ago. However, according to a widely     1    (accept)theory, the universe began with a“Big Bang" that     2    (throw) matter in all directions. After that, atoms began to form and combine to create stars and other     3    (body).

For several billion years after the "Big Bang", the earth wasilljust a cloud of dust. What it was to become was uncertain until between 4.5 and 3.8 billion years ago     4     the dust settled into a solid globe. The earth became so violent that it was not clear whether the shape would last or not. It exploded loudly with fire and rock. They were in time     5    (produce) carbon, nitrogen, water vapor and other gases, which were to make the earth’s atmosphere. What is even     6    (important) is that as the earth cooled down, water began to appear on its surface.

Water had also appeared on other planets like Mars but,     7    the earth, it had disappeared later. It was not     8    (immediate) obvious that water was to be fundamental to the development of life. What many scientists believe is that the continued     9    (present) of water allowed the earth to dissolve harmful gases and acids into the oceans and seas. This produced a chain reaction, which made     10       possible for life to develop.

If you went looking for a     1     (differ) planet, from Earth as you could find, you wouldn't have to go all that far, at least in space terms. Just look to     2     fifth planet in our, solar system, Jupiter. This gas giant has no solid surface. Its diameter (直径) is more than 11 times as great as Earth's. Its mass is more than twice than     3     of all the other planets in. the solar system combined. Jupiter's atmosphere is covered with bands of clouds and filled with vast     4     (spin) storms. The most famous of these is the Great Red Spot,     5     is so big that Earth could fit inside it.

Jupiter is also a planet full of     6    (puzzle). Those thick bands of clouds hide. what is happening inside the planet. Is there water? How much? Does Jupiter have a solid center? And then there's the question of just what     7     (drive) those monster storms.

Nine spacecrafts     8     (send) to study Jupiter by now. The most recent was Juno, which arrived at the planet in July 2016. It will orbit this gas giant at least until July 2021. When the spacecraft     9     (final) retires, its Earth-bound pilots will send it on a path to dive to its     10     (dead) into the Jupiter's atmosphere.

China’s first deep-sea floating wind power platform, invested in and built by the China National Offshore Oil Corporation (CNOOC),     1    (complete) its floating body assembly (组装) so far. It marks     2     important step in the construction of the world’s first offshore wind power project with a water     3    (deep) of over 100 meters and an offshore distance of over 100 kilometers.

The platform will be fixed in an offshore oil field 136 kilometers from Wenchang     4     China’s southern island province of Hainan,     5     strong winds and big ocean waves caused a huge challenge to the design of the wind power platform.

After the project     6    (put) into operation, the electricity generated by the turbine will be     7    (direct) connected to the power grid of the offshore oilfield group for oil and gas production. It will generate an annual power capacity of 22 million kilowatt hours, with carbon dioxide emissions     8    (reduce) by 22, 000 tons.

Li Nan, a senior researcher with the CNOOC, said that floating wind power has     9    (broad) application prospects than expected. Not only for local consumption and power supply for offshore facilities, it can also be used    10    (develop) marine pastures, seawater hydrogen production, marine tourism and marine mineral resources.

Technology has made parcel delivery faster, more convenient and     1     (smart). Ahead of China’s largest online shopping festival, Singles Day, which falls on Nov 11,     2     unmanned car filled with parcels appeared at Guangzhou Institute of Science and Technology in Guangdong Province. The vehicle,     3     started operation on campus on Nov 2, is set to better serve the busy parcel delivery season for students. The new member of the campus has attracted attention. Some young people     4     (stop) the car, followed it and took photos with it.

Painted white, the simple appearance of the car looks like a creature from the future in early science     5     (movie). It takes packages from the parcel collection station on campus to student dormitories. Four routes     6     (provide) on campus. “It aims     7     (solve) the ‘last-kilometer’ problem for parcel delivery services,” said Hu Jing, product manager in the company.

The vehicle runs at 15 km/h to ensure     8     (safe). When it meets an obstacle such as a car or a student, it stops and avoids the object, then carries on. Although the service is new to the campus, student Zhang Ziwen has used it frequently. She waits for the message from the delivery company which tells     9     (she) to pick up the package in front of her dorm. “It is much more convenient     10     saves time to walk to the parcel station on the other side of the campus.”