"He got to work really, really late "Cos he missed his train". Which cause and effect word is 'Cos short for?

Complete the following sentences using "because, because of, or due to.” I'm glad ___ my test score is good.

Toh pati has achieved many music awards ____ playing the guitar in his passion.

Fill the blank using connector showing cause or effect. He is a great chef he has worked hard and studied with the best master chef.

Fabiana will not go to work today ____ a bit ill.

I don’t want to go to the movies ­­­____ I hate the smell of popcorn. The correct answer to fill in the blank is ....