Oil dominates every aspect    1    our life. It fuels our cars, and it is used in production of our plastic goods and the electricity for our homes and factories. Moreover, it can even    2    (find) in the fertilizer for the soil in which our food grows. Oil makes nations     3     (extreme) wealthy, while shortages of oil can bring economies to their knees. In short, this black and sticky substance has been running    4    (we) world.

Standing on the shore of a lake, I couldn’t help admiring the hundreds of small rock that    1    (surround) my shoes. All created from hard surfaces, the rocks soften over time. And I was wondering     2    we could learn from a pile of rocks. Once was a sharp rock that was covered with pointy edges, and now I have found my attitude have softened and my desire to understand others     3    (expand) with time.

A group doctors,     1     had been specially trained in skiing skills in China over the last four years, provided medical treatment during the Winter Olympics. In the field, if there was an accident, the ski doctors had to be on the scene in four minutes     2     a 10-kilo medical bag and had to deal with the injuries and remove the     3     (injure) athlete from the track in just 15 minutes.

A housewarming party is a special party to be held when someone buys or moves into a new apartment or house. The person who has bought or moved into the house is the one who     1     (throw) the party. The party is a chance for close friends and family members     2     (congratulate) the person on the new home. It also gives people a chance to see     3     the new home looks like. And it is a good time to fill the new space with love and     4     (present) hopefully.

A hunting dog, who had been an excellent one in his time and done good service to his master, finally became worn out because of his old age. One day, when     1     (hunt) a wild pig, he seized the creature by the ear, but his teeth gave way. He     2     (force) to let go his hold, and the pig escaped. His master     3     (severe) scolded him. But the weak dog replied: “Spare your old servant! Remember what I was rather than abuse me for what I am.”

One evening I was going back from a supermarket. As I approached my car, I noticed one person     1     seemed a bum (流浪汉) standing beside me. I expected that he would ask me     2     some money, so I asked him if he needed help and his response was “Don’t we all?” I have never heard words     3     (astonishing) than those. Although I had money and a place     4     (sleep) in, I recognized that I needed help too. It was a true discovery to me.

The protection of the Yellow River is one of the top concerns for Chinese leadership. In the past two decades, the Chinese government     1     (strengthen) the protection of wetlands along the Yellow River,     2     (make) various wild birds gather in this area. The rising number of wild birds has brought a benefit for birdwatchers, who are very thankful for     3     the government has done for the people. Further efforts will be made to bring more beautiful environment to the Yellow River.

After a two-week-long trip to China, Dar became a skillful user of WeChat, an application that almost every Chinese would use in their daily life. During his stay in Beijing, Dar     1     (recommend) his family and friends to download WeChat so that they could contact through free WeChat video calls. And via the function of translation, Dar found it easy and efficient     2     (understand) what his friends were saying. As one of the many Chinese innovations nowadays, WeChat is only a glimpse of the energy and     3     (create) in today’s China.