The robotic lunar mission ended     1     (successful) early on December 18th. Chang’e 5’s reentry capsule,     2     (carry) rocks and soils from the moon, landed on the grassland in northern China. It is reported that Chang’e 5 mission is China’s most complicated and challenging space adventure, which     3     (make) China the third nation in the world to bring back lunar samples—right after the U.S. and the former Soviet Union. The mission’s results will contribute to deepening mankinds’ understanding of the origin of the moon and     4     (develop) of the solar system.

The European Parliament(议会)voted for     1    ( cancel) the summer time by 2021. The next step is to discuss the issue with EU countries.

The current law     2    ( make) EU countries move their clocks forwards on the last Sunday in March and move them backwards on the last Sunday in October.

Some people say that the summer time saves energy,     3     the European commission (委员会) says that the     4     (save) are small. Also, most people in the EU want to cancel the summer time.

3 . Billions of poor people around the world     1     (depend) on the use of wood for cooking. And as they take more and more firewood from wild areas, they are destroying habitats around the world. Wood collection is one reason why many animals have become endangered.

This is     2     Dr. Metcalf spends each summer in Africa. He wants to teach women and children in villages how to cook with the sun. He helped create Solar Cookers International. It’s an organization that introduces solar cookers to developing countries     3     teaches people how to use them.

4 . World Environment Day is a UN Environment-led global event,     1     takes place on June 5 every year and is celebrated by thousands of communities worldwide. Since it began in 1972, it has grown to become the     2     (large) of all the celebrations of environment each year. China owns half the world’s electric vehicles and 99% of the world’s electric buses. By     3     (host) World Environment Day 2019, the Chinese government will be able to showcase its innovation and progress toward a cleaner environment.

China plans to release one or two giant pandas into the wild. So far the spot     1     (select) in east China s Jiangxi province. It will be the first time to release a gaint panda into the wild outside southwest China’s. Sichuan Province,     2     13 pandas had been released by the end of last year.

An expert meeting was held in Jiangxi, where it was decided that pandas would be transported from Sichuan. Then they will be released into the Jiangxi Guanshan National Nature Reserve. The nature reserve     3     (have) a mild climate and a quite good ecosystem, with abundant bamboo     4     (resource) and little human interference, which is good for giant pandas to reproduce.

Researchers also     5     (brief) introduced the research method to experts. The method includes     6     giant panda reintroduction program, The reintroduction program refers to     7     (release) captive-bred (圈养繁殖的) pandas to their past distribution areas. They will live in these areas after wild training     8     (rebuild) the wild population. Researchers will obtain     9     (value) data. And the data shows how pandas adapt to the environment and climate after they stay at the wild habitats.

The program has high research value for studying some problems. Why did pandas die out in their historical distribution areas? How did climate changes influence the current panda population? The program will also help expand the distribution range     10     giant pandas. Besides, it can reduce the extinction risks of their wild population.