That's because you're a girl.

We can't sleep because of the noise.

I slept a little during lunch break because I was so tired.

We are haunted by an ideal life, and it is because we have within us the beginning and the possibility for it.

Your feet are swollen because your shoes are too small.

The airport was closed because of the fog.

I canceled my appointment because of urgent business.

I couldn't sleep well because it was noisy outside.

We abandoned the project because of a lack of funds.

The picnic was called off because of the rain.