3. Jill wanted to know if the flight would be delayed 
4. Your chores should be done before Mom gets home
VII.
1.it is necessary for you to practice English everyday
2.My teacher asked us to finish our homework before going to class
3. He suggested using solar energy to heat the house
4.John worked so carefully that it took him a long time to finish his work 
IV.
1.modernize
2.disappointed
3.performance
4.increasingly
IV.
1.This
2.improve
3.breathe
4.in
V.
1.Facebook is the world's biggest social networking site
2. Mark Zuckerberg
3. it has 150 million users today
4.Yes, it has

VII.
1.it is necessary for you to practice English everyday vì be sang is
2.My teacher asked us to finish our homework before going to class vì ashed sang bỏ ed
3. He suggested using solar energy to heat the house vì suggesten sang thêm ed
4.John worked so carefully that it took him a long time to finish his work vì work sang thêm ed