有人大声敲门以引起我们的注意。

Someone ___knocked on the door loudly to get our attention.

你能去应门吗？我觉得有人在敲门。

Can you answer that? I think someone is ___knocking at the door.

昨天，一个快递员敲了两次我的门。

Yesterday, a delivery person ___knocked on my door twice.