1. ???., people today are living much longer than their ancestors.1) Despite modern medical science and technology
2) Having benefited from medical and nutritional advances
3) By living in a world full of industrial pollution
4) Because of working hard and having stressful lives
| 2. Once the virus enters the bloodstream, it is carried to the liver??..it penetrates a cell and begins to multiply.1) when
2) for
3) where
4) that
| 3. It was only about 10,000 years ago that animals were first being domesticated and crops were being cultivated and harvested, ??.., humans had fed themselves through fishing, hunting birds and animals and gathering wild food.1) Before that time
2) Recently
3) Ever since then
4) Until today
| 4. The Sydney Olympics was regarded as???success.1) greatly
2) A great
3) A most
4) Mostly
| 5. The sex of a child is determined by parents chromosomes called sex chromosomes, X and Y. The mother always contributes an X. The father, on the other hand, may contribute either an X or a Y. ??.., the chromosomes from the mother and father form one of two patterns : an XX-a baby girl, or XY-a baby boy.1) Surprisingly then
2) Therefore, when united
3) However, if separated
4) Consequently, from time to time
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