3. He is too intelligent to answer the question.
4. I don't know how to use this computer.
5. I am delighted in seeing you again .
6. He is happy to know you have passed the exam.
7. Tom isn't old enough to drive a car.
8. It is difficult for me to live in HCM City.
9. They are good at doing homework.
10. It is too hot for us to go out.