Some kinds of animals can _______ the colour of their surroundings.

Where did you pick up the stamp?—It was at the post office ________ we worked in the summer vacation.

John saw a three-year-old child walking alone in a shopping mall , so he took the child home immediately and called the police . —But he have waited with the child until the parents returned .

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

I_________ a worker, but now I am anactor.