用适当的关系词或"介词+关系代词"填空

I just read a book called TechnoStress,  was written by Dr. Michelle M. Weil. Her co-author was Dr. Larry D. Rosen, is her husband and also a psychologist. According to the authors, everybody feels stressed about technology. Our cell phones,  we buy for emergencies, soon invade our privacy. Just because they can, people contact us at places we are relaxing. Another problem we are facing is that we have to learn too much too fast. Technological changes,  used to come one at a time, now overwhelm (淹没) us. Dr. Weil suggests that we read her latest book,  we can turn in dealing with technostress. It can be purchased from her website.