11.   In a day when American toys all seem to beep, flash or roar on their own, kid-powered Matchbox models become a worldwide phenomenon.

12.   Indeed, the Singapore development model has become a major export.

13.   Instead, the two retail models could eventually become indistinguishable.

14.   It is not unusual for accomplished models to become accomplished film actresses.

15.   Recent models have become increasingly versatile, with Kodak, Fuji, Konica, Vivitar and other manufacturers offering models designed for special purposes.

16.   Since going out of production, the model has become something of a collectible.

17.   So the models become knowledgeable resources for fashion.

18.   The climate experts on the panel believe their models have become increasingly reliable.

19.   The model has become popular with airlines for trans-Atlantic flights, replacing older planes, partly because it has a lower operating cost than older models.

20.   The models she established became a basis for studying potential medications to treat drug abuse in further experiments.