1. 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
| 2. This homework is optional, ?????.1) you must not do it
2) either you do it or you fail
3) you should do it now or later
4) you don´t have to do it
| 3. Dear Abby : I am a high school student. I´m a pretty good boy-I get good grades, do the laundry, etc. I asked my parents if I could get my tongue pierced,??. Don´t you agree my parents are being unfair and unreasonable?1) My mother said she would never change her mind
2) They won´t consider it
3) Most of my friends didn´t get A´s
4) I just got my report card today and I got all A´s
| 4. ?????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
| 5. He is happy to welcome you into his home, ????.1) a small apartment on sukhumvit road
2) his father came from china
3) that is, his bedroom is being repainted
4) he is a part-time teacher
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