iPad songs stuck "preparing to download"

I used iTunes Match to download about 300 songs on my iPad 2. But these songs stuck on "preparing to download" with no progress in iTunes for a couple of days. The internet connection works fine. Try restarting iPad and signing out of my apple account and back again. That's still no working. I can't also clear them.How to fix songs "preparing to download" issue* On your computer, deleted the