1. 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
| 2. People who live near the sea usually ??. to swim.1) knew whether
2) have known when
3) can know why
4) know how
| 3. ?????most people like to sleep approximately eight hours a day, researchers believe we can survive comfortably on half that much.1) As we know that
2) In spite of the fact that
3) Whenever it looks like
4) Even so it seems to be
| 4. 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
| 5. The Sydney Olympics was regarded as???success.1) greatly
2) A great
3) A most
4) Mostly
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