他正在向人们宣布重要的事情。

He is ___announcing something important to the people.

市长将在明天的新闻发布会上宣布新的环保政策。

The mayor will be ___announcing the new environmental policy at tomorrow's press conference.

门铃响起时我正在厨房，所以没听到他宣布自己到了。

I was in the kitchen when the doorbell rang, so I didn't hear him ___announcing his arrival.

落叶的飘零预示着冬天的到来。

The falling leaves are ___announcing the arrival of winter.