It’s a long time ____ I saw you last— Yes, and what a pityIt will be a long time ____ we see each other again

Sorry, I have to ______ now. It’s time for class.—- OK, I’ll call back later.

Some people ________ land because they regard it as a commodity belonging to them.[ ]

The society was set up to endangered species form extinction.

If only we ____ the disease was curable then.[ ]