Page 169 Exercises 4-5

4) 

a) As it was a public holiday, there was a lot of traffic on the roads. (being)
    It being a public holiday,there was...
b) When I opened the letter, I realized  it was from professor Alton. (on)
    On opening the letter, I realized...
c) The palace was destroyed by fire during the war but later reconstructed. (though)
    Though destroyed by fire during the war...
d) As Carol walked from the room, tears streamed from her eyes. (streaming)
    Carol walked from the room, tears streaming from her eyes.
e) I broke the camera as I tried to remove the memory card. (in)
    In trying to remove the...
f) My hair has become soft and shining since I've used Glosso shampoo. (using)
    Since using Glosso shampoo, my hair...
g) Jan was taken to hospital after she was knocked down by a car. (being)
    Jan was taken to hospital after being knocked down...
h) After he had been shown to his room, George lay down on the bed and slept. (having)
    Having been shown to his room, George...

5)

Restoring the sight of people blinded by macular degeneration, a condition of the eye, could start within five years, according to a British team developing human eye stem cell implants. More than 500.000 people in the UK have blindness caused by macular degeneration, a disease marked by a loss of central vision due to degeneration of the macula, a spot at the back of the eye. Having been given almost €4 million towards the cost of developing a stem cell therapy  by an anonymous  philanthropist, a team from two British universities are starting to conduct trials. Commenting on the project, a spokesman for the team told us affecting up to one third of the population, this condition is a major cause of blindness,  so a new kind of treatment is vital. In previous operations, having transplanted tissue from patient's own eye, we have seen about %25 of patients report improvement. However, creating new eye cells grown in the laboratory from human embryos will be much more effective.