We have planted thousands of trees in recent years. This year _____ we’ve planted ten thousand trees.

Luckily, only a few passengers aboard were ________ injured in the traffic accident.

We don’t care if a hunting dog smells _____, but we really don’t want him to smell ____.

Although the painting is very ____ pleasant, it is thought to be copied with a modern printing machine．

_____ three influenza type A virus subtypes(子类型) have been found in pigs.