21. ____(not, know) her address, we couldn't get in touch with her.

20. ____(turn) a corner, you'll come to a dense wood.

19. ____(be) a tailor, she knows how to deal with this material.

18. ____(be) so poor. in those days, we couldn't afford to send the boy to hospital.

17. ____(fear) that it might rain, she took an umbrella with her.

16. ____(recognize) who the customer was, the manager apologized and scolded the assistant severely.

15. ____(feel) cold and lonely, I went downstairs and sat in front of the television.

14. ____(glance) at the painting briefly, the dealer said that it was worth ＄5.

13. ____(see) a little boy running across the street, the driver stopped his car all of a sudden.

12. ____(hear) a footstep below, he rose and went to the top of the stairs.