我们都对这悲惨的事态发展感到震惊。

We were all shocked by this tragic ___turn ___of ___events.

她对如此意想不到的事态发展毫无准备！

She was not prepared for such an unexpected ___turn ___of ___events!

突然的事态发展迫使我们重新思考策略。

The sudden ___turn ___of ___events forced us to rethink our strategy.