II.1, Because I was tired, I went to bed early.
2, If you work hard, you will pass your exam./ Unless you work hard, you won't pass your exam
3, Unless you bring it back on Monday, you can't borrow my dictionary.
4, A scientist ,who discovered a new planet, has won the Nobel Prize.
5, A building which was destroyed in the fire has now been rebuilt.
6, Although the forecast said it would rain, it turned out to be a beautiful day.
7, She isn’t English but she speaks English perfectly.
8, Thuy hasn’t met her old friends since they left school.
9, What about using gas instead of burning coal?
10, Mary suggested that Peter should not complain to the company.
