1. Because of a lot of smoke, the air is polluted
2. Because lf an accident, the traffic was block
3. Because lf having a great deal of honework, she cannot go out tonight
4. Due to the temperature of water's changes, the living pattern of the marine animals have changed
5. Due to the difficult situation, they have to consult their professor
6. Due to the thick fog, the flight will be put off until 8 a.m