农民用马拉着装满干草的马车。

The farmer used a ___horse to pull the wagon loaded with hay.

她在平衡木训练前先在马上练习动作。

She practiced her moves on the ___horse before training on the balance beam.

他曾经沉迷于毒品，尤其是海洛因。

He was once addicted to drugs, especially ___heroin.

木匠把木板放在两个锯木架上进行切割。

The carpenter placed the board on two ___horses to cut it.