1. Because of the icy roads, we drove very slowly.

   The roads were icy, so we drove very slowly.

2. Because the house's price was high, they didn't buy it.

   The price of the house was high, so they didn't buy it.

3. Because the weather was cold, she wore a coat.

   The weather was cold, so she wore a coat.

4. Because the performance was long, she left sleepy.

   The performance was long, so she left sleepy.

5. Because of the heavy rain, they stayed at home.

    It rained heavily, so they stayed at home.

1/ Because of icy roads, we drove very slowly.

     The roads were icy, so we drove very slowly.

2/  Because its price is high, they didn't buy the house.

      The price is high, so they didn't buy the house.

3/ Because the weather is cold, she wore a coat.

    The weather is cold, so she wore a coat.

4/ Because the  performance is long, she left sleepy.

    The performance is long, so she left sleepy. 

5/ Because of heavily rain, they stayed at home.

    It rained heavily, so they stayed at home.