I was about to give up the maths puzzle when an idea _________ upon my mind．

1. A.
   hit
2. B.
   struck
3. C.
   flashed
4. D.
   happened

He was about to tell me the secret______someone patted him on the shoulder.

1. A.
   as
2. B.
   until
3. C.
   while
4. D.
   when

She was about to go to bed when it suddenly _____ to her that she hadn’t turned off the gas

1. A.
   happened
2. B.
   occurred
3. C.
   explained
4. D.
   referred

I was about to leave for work ______the telephone rang.

1. A.
   as
2. B.
   until
3. C.
   while
4. D.
   when

Tom was about to close the window__________his attention was eaught by a bird.

A.when     B.if     C.and     D.till