Unit1 1. We have a problem with the computer sysem, but I think its fairly minor. 2.My father died when I was too young to live on my own. The people of my hometown took over(responsibility) for my upbringing at that point. 3. The toys have to meet strict/tough safety requirements before they can be sold to children. 4.Radio and television have supplemented rather than replaced the newspaper as carriers of news and opinion. 5.When it comes to this magazine, it is/carries a digest of articles from many newspapers and magazines around the worldUnit21.Though greatly affected by the consequences of the global financial crisis, we are still confident that we can face up to the challenge and overcome the crisis. 2.Under threat of constant sand storms, we were compelled to leave our cherished village and move to the new settlement. 3.According to a recent online survey, a lot of consumers say they may be motivated to consid er buying products shown in TV commercial. 4.Having spotted a truck driver dumping contaminated waste alongside the river, the old man reported to the police at once. 5.Some scientists hold to the firm conviction thatpeople will come to like genetically modified crops someday since they can increase yields and help combat hunger and disease in the developing world.Unit3 1. The Internet is changing the way people live, no matter whether they are in urban or rural areas. 2. Mediumsized and small companies are more vulnerable to the threat of the global economic crisis than large ones. 3.With regard to our term papers, the professor asked usto analyze the chart of unemployment first, and then provide critical reflections on the nations economic development. 4.It never occurred to him that their team would win the basketball match by a large margin. 5.Looking back on my twenty years teaching in high school, I attributed my success to patience, talent, and the constant pursuit of knowledge.Unit4 1. The volunteers sent/assigned by the Red Cross disinfected, with great caution, the drinking water in the village so as to avoid an outbreak of plague. 2.Einstein spent many years trying to unify the theories of electromagnetism and gravity but failed. 3.Professor Wang received/won the Presidental Award f or his excellence in stimulating students creative imagin ation. 4.As there were some major design flaws, the board of directors didnt approve of theeconomic stimulus package. 5.Having realized that nobody could hepl h im,Jordan finally came to the conclusion th at he had to face reality and take up/meet t he challenge by himself.