Because / Because of

I couldn't go to school two days ago ____________ I don't know the terrible flu I had.

........ you, I always try my best to achieve my aim.

......... the heavy rain, they have to put off the meeting.

Sarah is in bed .............. she has got a terrible cold.

.................. the water shortage in the dams this year there will be frequent water cuts in this region.

She wanted to go shopping last week ............... she needed a new laptop.

More and more people get to work late every day .......... the heavy traffic in the city center.

It's difficult to breathe in this industrial area ............ the smoke coming from the factories.

........... the weather is warm and sunny, the children are planning to go for a picnic.

............... his lack of courage, Nathan didn't participate in the competition.