Our teacher looked here and there on our playground ________ looking for something.
( ) 19. What surprised me most was not what he said but _____ he said it.
( ) 18. If the work _______ by the end of the month is delayed, the construction company will be fined.
( ) 17. In those days, whenever I had difficulties, I _______Mr Shen for help.
( ) 16. ----- Has John arrived yet? ----- No, she _______ an hour ago.
( ) 15. The building is ________.