It definitely feels good     1     (be) back in San Francisco again. In 1906 a big earthquake    2     (strike) the city. Amazingly, it was able to rebuild itself.     3     (locate) on top of big hills, many beautiful old buildings offered great views of the city, the ocean, and the Golden Gate Bridge. There is the Mission District near downtown, one of the     4     (old) parts of the city. Many of the people living here are from Mexico or Central America. This district used to be a poor area of town, but is now a centre for art, music, and food. An art movement that started here     5     (call) the “Mission School”.     6     (walk) around and looked at the street art for a few hours, she ate some delicious Mexican-Chinese noodles for lunch. In the afternoon, Li Lan headed to a local museum,     7    she learned a lot about the history of California. In 1848, gold     8     (discover) near San Francisco, which made over 300,000 people from all over the world rush here     9     (seek) their fortune. The museum did a really good job of showing     10    America was built by immigrants from different countries and cultures.

Cloning has two major uses. First, gardeners use it to produce large     1     (quantity) of plants for sale. Second, it is valuable for research on new plant species and for medical research on animals. Cloning plants is fairly straightforward, while cloning animals is much     2     (complicated) and difficult. Over the years, many scientists failed in their attempts to clone animals, but their determination and     3     (patient) paid off in 1996 with a breakthrough-the cloning of Dolly the sheep.

Tu Youyou was awarded the Nobel Prize in 2015 for her research,     1     led to the discovery of artemisinin. Artemisinin has saved a large number of lives since it was discovered. After     2     (graduate) from university, Tu Youyou worked at the China Academy of Traditional Chinese Medicine. In 1967, Tu Youyou     3     (choose) as a researcher of a team of scientists with     4     purpose of discovering a new treatment for malaria.

An only child is a person with no siblings (兄弟姐妹). Some people think only children are selfish, lonely, or unhappy. They say     1    is difficult for an only child to play or work with others. This     2     (call) the “Only-Chld Syndrome (综合征).”

It is true that parents expect a lot from their only child-similar     3     the oldest child in other families. Only children are often very responsible (有责任心的). They are better at     4    (communicate) well with people because they speak mostly with adults (成年人) at home.

Like middle children, only children are more likely to make     5     (friend) outside the home. This is     6    (nature). They need to play with other kids.

Like the youngest children, only children may be a little spoiled by their parents. They get 100 percent of their parents’ time and attention.

Polly Hollingsworth is my next-door neighbor. We     7     (be) also born on the same day. She is an only child. Polly says that she is neither lonely     8    unhappy. She doesn’t fit the description of an only child. She can talk to people     9     (easy) and she is not afraid of anything.

In fact, there is no big     10     (different) between only children and people with siblings. Only children are just like other children.

Speaking of map apps, some users have found that they are useful for more than just finding one’s way. One man, San Francisco’s Lenny Maughan, uses them     1     (make) works of art. Wherever Lenny runs, he tracks his progress by using an app, such as Map MyRun or Strava. As he runs, the app traces a line along the path he follows. So, to make his runs more fun, Lenny decided to run in patterns that would create     2     (amaze) images. To date, he has shared runs that have turned into images of     3     heart, a portrait of artist Frida Kahlo, and more.

The opening ceremony (开幕式) of the 19th Asian Games in Hangzhou was    1    amazing display of Chinese culture and innovation. With shocking visuals, innovative performances, the ceremony was a feast for the senses. The ceremony was themed “Memories of Jiangnan”,     2     (creative) using the element of water to showcase the region’s natural beauty and cultural charm. The ceremony also contained elements of Liangzhu culture and the Qiantang River tides,     3     (promote) China’s long and storied history and cultural heritage.