…and it all looks like relatively low resolution .jpegs and .png files in other words bitmaps. Not having tried MsWord in yonks I don't know if it can handle industry standard vector files like .pdf, .eps and .ai. It certainly used to always have trouble with them when I had to use Office.
The quick answer is yes, sorta. Microsoft's clipart is in a proprietary format so you can't just browse for it using Pages but if you have Word running you can search for clipart and insert it into a Word document and then copy and paste it into Pages. This will work for clip art but not for smart art or word art.