David is ________animal fur, so he won’t visit anyone who has cats or dogs in the house.

Speaking of all the songs he has written, I think this is probably his ________ one. 

—I wonder if she will show up at the  concert .----She will . She is only too _______to watch the famous director.

At times the balance in nature is ______，resulting in a number of possibly unforeseen effects.

It’s_____ that we should have to queue, when we have already got our tickets.