There is always a person in your life that you can count on. That person is the one that 1 you life and loves you unconditionally. A mother's love is priceless and will always 2.Their care and love is like a beautiful rose, 3 a rose that is unable to die. 4 overpowers the warmth when a mother's hug（拥抱）is received. You can 5 the warmth in your happy moments, but most 6 in your saddest ones.

    My mother is the 7 person I know. She has been through so 8, yet she was able to move on and love her 9 as well as she did. She had the 10 to get away from a sad marriage. She11 without a job, a place to live, or money for that matter. She never 12 us nor herself. She went to 13 and did a master degree. Working hard and making sure that none of her children were missing anything was her number one 14. The stress（压力）of being a 15 mother made her love for us much stronger.

    I believe that the separation gave my mother more hope and 16 She knew how much my siblings（兄弟，姐妹）and I were 17, but she comforted us with her love. She is the one who 18 the house running and under control. 19 it may seem to her that we 20 her love for granted, I can assure her that it can't be…a mother's love is priceless.

    The world's most human-like robot has begun work as a university receptionist. And scientists positively predict the new technology will 1 provide childcare and offer 2 to lonely elderly people.

    With her soft skin and flowing dark-brown hair, Nadine does not only meet and greet3, smile, make eye contact and 4 hands, but she can even5 past guests and get into conversation based on 6 chats.

    Unlike 7 robots, Nadine has her own personality and 8 . She can be happy or sad, 9 on the topic.

    Powered by intelligent 10 similar to Apple's Siri or Microsoft's Cortana, she is the creation of scientists at the Nanyang Technological University in Singapore and is based on her creator Prof Nadia Thalmann.

    Prof Thalmann, the director of the Institute for Media Innovation who led the development said robots such as Nadine are bound to become more visible in offices and 11 in future.

    “Robotics technologies have 12 significantly over the past few decades and are already being used in manufacturing and logistics,” she said.

    “As countries worldwide face 13 of an aging population, 14 robots can be one solution to 15 the shrinking(缩小的) workforce, become personal 16 for children and the elderly at home, and 17 serve as a platform for healthcare services in future.”

    “Over the past four years, our team at NTU have been 18 cross-disciplinary(跨学科的) research in social robotics technologies— involving engineering, computer science, linguistics, psychology and other19 — to transform a virtual human(虚拟的人), from within a computer, into a 20 being that is able to observe and interact with other humans.”

其中，能表示从集合M到集合N的函数关系的个数是（   ）