他故意把钥匙掉在地上，想引起注意。

He ___dropped his keys on the floor on purpose to get attention.

股价在下午突然下跌了10%。

The stock price suddenly ___dropped by 10% in the afternoon.

他不小心把钥匙掉在了地上。

He ___dropped his keys on the ground by accident.

她因为太忙而放弃了瑜伽课程。

She ___dropped the yoga class because she was too busy.