$VIII$
1. learning
2. are
3. of
4. you
5. how
6. book
8. yourself
9. learning
10. practice
$X$
1. It's important to keep the environment clean.
2. The time machine will be shown to the public when it is finished.
3. He was delighted that his aunt sent him a letter.
4. People recycled old car tires to make shoes and sandals.
5. I'm very sad not to be accepted in that group.
6. I haven't spoken to her for 3 years.
7. Tam used to type faster than she does now.
8. My father asked me to turn down the radio for him.
9. When did you use the pen ?
$XI$
1. Minh has collected stamps since he was a child.
2. I am working tomorrow, so we can not go somewhere.
3. They are going back to England in two months.
4. TV is bringing not only information but also entertainment.
5. At home on the farm life is always a struggle with nature.
$@bangtann $