他轻轻敲了敲窗户，想引起里面人的注意。

He gently ___knocked on the window to get someone's attention inside.

她跑得太快，不小心撞到了门上。

She was running too fast and accidentally ___knocked into the door.

这场风暴把我们的电力供应砍掉了一半。

The storm ___knocked our power supply down by half.

他在会议上毫不留情地批评了同事的方案。

He ___knocked his colleague's proposal harshly during the meeting.

这次促销活动把原价打五折。

The sale ___knocked 50% off the original price.