完形填空。阅读下面短文，掌握其大意，然后从各题所给的四个选项A、B、C和D中，选出最佳答案。
“I wish I'd known this before” is a statement often said by us when we realize we've made bad decisions.1.________ you don't want to have regrets，you must realize some factors that cause poor decisions. For example，lack of foresight is 2.________ of such factors. Many times，we tend to concentrate only on the “right now” of a certain decision 3.________ fail to understand its effects on our future. Ideally，we 4.________ practise proactive thinking (主动思考) to predict the changes in future.
