由于天气不佳，他们取消了明天的野餐。

They had to ___call off tomorrow's picnic because of the bad weather.

猎人决定停止追踪那只受伤的鹿。

The hunters decided to ___call off the chase after the injured deer.

教练叫停了训练，因为天气突然变坏了。

The coach ___called off the training because the weather suddenly turned bad.