题目内容：

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This summer, the most popular touristy sight in China is Tibet. Why? Because the Qinghai-Tibet Railway was open on July 1.

The Qinghai-Tibet Railway is the first railway between Tibet and other parts of China. It is 1,142 kilometers long and is the world’s highest railroad.

About 960 kilometers of it is over 4,000 meters above the sea level. Many people thought it was impossible to build a railway so high. But the railroad was successfully completed last October.

The railway makes travel cheaper for Tibetans. Most of them don’t have enough money to travel by air.

It will also bring more tourists to Tibet. A recent Xinhua report said that the new railway will bring 3,000 to 4,000 tourists to Lhasa each day. In Shanghai, one travel agency has worked out a 10-day-trip from Shanghai to Lhasa at a price of 3,600 Yuan.

A railway trip to Tibet is more comfortable than driving or flying. Each train has special windows to keep out ultraviolet rays（紫外线） and sandstorms.

Thin air makes you feel sick. To stop this from happening, the train gives oxygen through its air-conditioning system. If you feel sick, you can find oxygen masks near the seats.

1.This summer, the most popular touristy sight in China is _________.

2.The Qinghai-Tibet Railway is the World’s highest railroad and it is _________ long.

3.The railroad was successfully completed _______________]

4.The railway makes travel to Tibet _________ than by air.

5._________________ makes you feel sick. So you can find oxygen masks near the seats.