Wang Kun and Wang Wei are brother and sister. They have dreamed of     1    (take) a great bike trip. Wang Wei persuaded his sister     2    (buy) an expensive mountain bike.     3    was Wang Wei who first had the idea to cycle along the Mekong River. They     4    (ride) bicycles to travel along the Mekong River, whose source is in Qinghai Province. When it     5    (enter) Southeast Asia, it travels slowly through hills and low valleys and the plains where rice grows. Despite the     6    (difficult), Wang Kun and Wang Wei were       7    (determine) to begin their journey at     8    altitude of more than 5,000 metres in Qinghai Province. During     9    (they) journey, they enjoyed the continuous change of the weather. Finally, they reached Dali in Yunnan Province,     10    Daowei and Yu Hang joined them.

Peru is a country on the Pacific coast of South America. It consists     1     three main parts: narrow, dry, flat land     2     (run) along the coast, the Andes Mountains, and the Amazon rainforest.

Spanish is the main language of Peru. It is because Peru     3     (rule) by Spain from the 16th century to 1821. But before that, Peru was the centre of the ancient Inca Empire, and its emperor lived in what is now known as the site Machu Picchu.

Peru is an    4     (amaze) destination with something for tourists. Here     5    (be) two magical tours: Amazon Rainforest Tour and Machu Picchu Tour. In Amazon Rainforest Tour, you can first take     6     short flight into the Amazon rainforest and then travel for a day to your     7    (accommodate) by boat. In the following three days, you can explore the unique rainforest with a local guide. In the other tour, you can take a four - day hike through the Andes Mountains to the city of Machu Picchu. After     8    (explore) the ancient city, you will find it very amazing,     9    ( especial ) the Incas ‘ dry stone method of building. Inca builders cut stones     10     exactly that nothing was needed to hold walls together.

Everyone     1     (complain) about being stuck in traffic. It is quite possible that the future city will have no traffic at all. H.G Wells, in his book The Sleeper Awakes, tells something about the traffic. In the streets of that future London there will be no vehicles. The city     2     (provide) with moving roads. One side of the road travels     3     one direction; the other side moves the opposite way. Anyone who wants to go to another part of the city steps on     4     moving “way” and sits on one of the seats until he arrives. He has none of the troubles,     5     a private car brings with it: whether there is enough petrol, whether the tires are all right, where to park it. The moving way is always at his service, always moving     6     (silent) along, always ready     7     (take) him to his destination. That city of the future has no traffic jams.

To link up the     8     (vary) cities, vehicles driven by atomic power will pass along highways     9     (divide) into two main groups of lanes. Each group will consist of several lanes, some for slow traffic, some for fast. Crossroads will not exist on these highways, but will be replaced by bridges and junctions (交叉口). Where these highways enter     10     (city), ports and other built-up areas, they will pass through underground tunnels.

Bike-to-Work Day is held every year across North America on the third Friday of May. It     1    (start) by the League of American Bicyclists in 1956, which is aimed     2    (promote)the bicycle as a serious choice of getting to and from work. In today's world     3     global warming is a serious issue, the bicycle is a perfect way of reducing our carbon footprint Cycling to work is a healthy alternative to driving to work. A healthier society means there is not so much pressure on the country's health system and cycling is also much     4    (kind) on your pocket than driving. Another benefit of cyclic is that you may be more creative and full of energy once you get to work, which will improve your     5    (perform).

Bicycles are a very common form of transport in the world. There     6    (be) about one billion bicycles worldwide. That makes it the most popular invention ever. When we think of some     7    (country), like China, we imagine a large number of people's cycling every-where. Even in high-tech Japan,     8    is possible to see businessmen, farmers, mothers or workers in the streets on their bikes. We use bicycles today for recreation, fitness and so on.     9     the bicycle, much of the world might stop     10    (work)!

Electric vehicles are currently a part of the car market, which     1    (occupy) mostly by gas-powered cars. But more electric car models will come out in the next few years. Governments,     2    (particular) in European countries and China, are pushing this change     3    (reduce) carbon emissions and fight global warming.

Keeping electric motors charged is cheaper than     4    (buy) gas. But how long does it take to charge an electric vehicle? There are several ways to charge electric vehicles and times range from minutes     5     half a day. The slowest way to charge is on a standard 120-volt (伏特) charger,     6    adds just a few miles of range per hour. For trips that involve hundreds of miles in a single day, drivers typically rely on DC fast chargers. These chargers are much more expensive to install, and thus     7    (rare). For would-be buyers, the lengthy charge times can sound alarming. And convincing them to try their first electric vehicle     8    (be) a challenge for the auto industry.

Going electric is not only an eco-friendly goal     9     also a business reality, according to industry analysts. But even if the general path ahead is widely agreed on,     10     speed of the change is far from clear.