选用because或because of填空。

1. _____ his bad leg, he couldn't walk so fast as others.

2. They didn't go swimming _____ it was raining hard.

3. —Why can't you do it now?

    —_____ I'm too busy.

4. He didn't come today _____ his illness.

委托评估是商品房开发贷款评估可采取的方式之一。