Only when his mother arrived ___________.

Where did you pick up this wallet? —It was in the supermarket _____ I did some shopping yesterday[ ]

The following day she didn’t go to the club. __________, she walked her dog in a park nearby.

What’s wrong with him?—The picture he came across his memory of a sad story in his childhood.

The _____ of the harmful chemicals on the world’s lakes and oceans has raised awareness of the public.