我在促销期间以半价买到了这件衬衫。

I got this shirt ___half ___price during the sale.

儿童可以半价进入博物馆。

Children can enter the museum for ___half ___price.

节假日期间，许多商店的商品都以半价出售。

During the holidays, many stores sell items at ___half ___price.