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IX/
1. John has been chosen for the school football team.
2. The teacher doesn't speak slowly enough for me to understand.
3. This is the first time he has got to the church for a wedding.
4. The story wasn't boring, was it?
5. Unless we try to save our sources of energy, they will soon end.
x/
1. I have a five-year old sister.
2. Nam is 10 cm taller than Mai.
3. No matter how hard she tried/studied, she failed the exam.
4. I and He speak the same language.
5. Despite performing well, she didn't receive good comment from critics.