— Was it under the tree ________ you were away talking to a friend?— Sure. But when I got back there, the bike was gone.

The earth will become worse and worse ________ we do something to stop her from being polluted.

He has ever read the story book, _____?

We really enjoyed the school trip yesterday, ________________ it rained in the afternoon and some of us got wet.

---Did you hear the rain? ---______ .