John must have forgotten to return the magazine to the library yesterday, _________?

know, I met my girlfriend’s parents for the first time only yesterday.— ________ I thought you’d met them before.

Eco-tourists want to learn about the world _______ they can make it better, or at least understand it better.[ ]

Many died or returned home, but most remained in California to________a life for themselves in thenew towns or on farms. [ ]

I haven’t finished my work ________.