Every new year of the last decade I set a personal challenge. My goal was       1       (grow) in new ways outside my day-to-day work running Facebook. These       2     (lead) me to learn Mandarin, code an AI assistant for my home, read more books, run a lot more, and get       3     (comfortable) with public speaking.

When I started these challenges, my life was almost all about building the Facebook website. Now there’s so much more to learn. At Facebook, we’re building lots of different apps and technology and we’re handling a lot more social       4     (responsible). And   outside Facebook, I’m a father now and I love spending time with my family, working on our charity and improving at the sports and hobbies I       5     (pick) up over the past years.

This decade I’m going to take       6     longer term focus. Rather than having year-to-year challenges, I’ve tried to think about       7     the world and my life will be like in 2030 so I can make sure I’m focusing       8       those things. By then, if things go well, my daughter Max will be in high school. We’ll have the technology to feel       9       (true) present with another person no matter where they are, and scientific research will have helped cure       10       prevent enough diseases to increase our average life expectancy(平均寿命) by another 2.5 years.

Life on Mars

Some people believe humans could live on the planet Mars by the year 2100. Our own planet, the Earth, is becoming more and more crowded and polluted because of the rapid increase in population.     1    (hopeful), people could start all over again and build     2     better world on Mars. Here is what life there could be like. At present, our spacecraft are very slow—it would take     3    (month). With the development of technology, the journey might only take about 20 minutes by 2100 in spacecraft     4     travel at the speed of light!     5    , the spacecraft would travel so fast that the journey might be quite     6     (comfort). Many people would feel ill. Humans cannot survive     7     water, oxygen or food. Nobody knows     8     there would be enough water or oxygen on Mars for people there. Gravity could be another problem. The gravity on Mars     9    (be) only about three-eighths of that on the Earth. People would have to wear boots that are specially designed to prevent     10     from floating off into space. Life on Mars would be interesting as well as challenging.