Q1.
The flight is delayed(because of, despite, the fact that after) the black rain storm.
Q2.
I played computer games(furthermore, after, because of )I had finished the revision.
Q3.
(Despite the fact that, Or, In contrast) he comes from a rich family, he doesn't always buy luxurious items.
Q4.
You'd better go to bed early (or, because of, after) you won't have energy for the competition tomorrow.