1. Jim was absent from class yesterday because/ since/ as he was suffering from a bad cold.

2. They decided to move the house so that they don’t have to travel a long distance to work.

3. Mary heard her fingers yesterday when she was preparing dinner.

4. At 4 pm yesterday, my mother was cleaning the house while I was looking after my younger brother.

5. They decided to go on an excursion because they want to get away from work stress.

6. My father taught me how to use the computer before I didn’t know how to use it.

7. I will call you as soon as I arrive at the station.

8. My brother is very out-going whereas I am quiet reserved.

9. Mr. Peter was walking home when He was robbed of his wallet.

10. I don’t have a pet because my mother doesn’t allow me to have one.

1)Jim was absent from class yesterday.he was suffering from a bad cold

=> Jim was absent from class yesterday because he was suffering from a bad cold.

2)They decided to move their house.they don't have to travel a long distance to work

=> They decided to move their house so (so that) they don't have to travel a long distance to work

3)mary hurt her fingers yesterday.she was preparing dinner

=>Mary hurt her fingers yesterday while(when) she was preparing dinner

4)At 4pm yesterday,my mother was cleaning the house.I was looking after my younger brother

=> At 4pm yesterday, my mother was cleaning the house while I was looking after my younger brother.

5)They decided to go an excursion.They want to get away from work stress

=> They decided to go an excursion since/because they want to get away from work stress.

6)my father taught me how to use the computer.before that, I did't know how to use it

=> I didn't know how to use the computer until my father taught me how to use it

7)I arrive at the station.I will call you right after that

=> I will call you as soon as I arrive at the station.

8)My brother is very out-going.I am quite reserved

=> My brother is very out-going but I am quite reserved.

9)Mr.peter was walking home.he was robbed of his wallet

=> Mr.peter was walking home when he was robbed of his wallet.

10)I don't have a pet.my mother doen't allow me to have one

=> I don't have a pet because my mother doen't allow me to have one.