1.You should not have allowed a four-year-old child to walk home alone.
2. Not until I left home could I realize how important the family is.
3. Mrs. Green is pround of what...her son contributed to the play...
4. We have booked five rooms,only two of which have air conditioning....
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1. It's possible to hear her name being called (might)

-> Karen...might not hear.. her name being called.

2. " Don't forget to look the house when you go out, William" his mother said (reminded)

=> William's mother ...reminded him to lock the house......... when he went out.

3. Nobody expected her to lose, but she did. (against)

=> Against..everyone's expectation,... she lost

4. There weren't many guests at the wedding. (only)

=> There were.only fews... guest at the wedding.

5.Promise to look after it and you can borrow my tennis racquet . (long)

=> You can borrow my tennis racquet,....as long as you promise.... to look after it.