视频和书现在正在销售。

The video and book are now ___on ___sale.

昨天我和朋友们去逛街，看到这条漂亮的裙子正在打折。

I went window shopping with my friends yesterday and I saw this beautiful skirt ___on ___sale.

许多圣诞装饰品在十二月打折销售。

Many Christmas decorations are ___on ___sale in December.