It was __________ computer games that cost the young man a lot of precious time that he
should __________ on his lessons．

1. A.
   to play; be spending
2. B.
   playing; spend
3. C.
   played; have spent
4. D.
   playing; have spent

It was not ________ she took off her dark glasses ________ I realized she was a famous film star．

1. A.
   when; that
2. B.
   until; that
3. C.
   until; when
4. D.
   when; then

It was on the farm ________ he spent his childhood he learned how to grow vegetables．

1. A.
   where; that
2. B.
   which; when
3. C.
   that; that
4. D.
   which; which

It was said that not until the old man had passed away ________ to his relatives．

1. A.
   she let out the secret
2. B.
   was the secret let out
3. C.
   out she let the secret
4. D.
   out let the secret

It was_______computer games that cost the boy lot of time that he ought to have spent on his lessons.

to have played        B．playing     C．played           D．having played