5. they aren't allowed to smoke in the office -> they musn't.........
6. the thick fog prevented Nam from going to work. -> it was.........
7. he was crossing the road. I caught singh of him -> I noticed..........
8. She wished she had attended the conference -> She regretted..........
9. We couldn't finish the task because it was very hard -> The task was too very hard.......
10. He should give her a special present on her birthday -> She.............
11. I will meet BogBang in Korea -> It is......
12. We expect the children to repaint the fence around ourr house -> the fence around our house.........
13. He worked out the answer. It was clever of him..........
14. Marie always pays her bills regulary. She's careful that way -> Marie is always.....
15. It is not necessary for Hoa to go shopping today -> Hoa doesn't........