=>
1. Because of being sick, she could not go to school.
2. I haven't met him for 3 years.
3. Because of finishing her homework, Lan went out.
4. His hobby is doing morning exercise.
5. It's two years since I met him.
6. It is very difficult to use this machine.
7. Because he was lazy, he failed the exam.
8. It is four years since my mother visited Tay Nguyen.
9. I find collecting stamps interesting.
10. What is his favourite hobby?

VI/
1. friend
2. since
3. same
4. though
5. lost
6. humour
7. together
8. still
9. trip
10. have
VII/
1. worthless
2. justify
3. reasonable
4. application
5. approval
6. arrangement
7. confirmation
8. denials
9. development
10. dismission