l. There is a push-pin. It is holding up this piece of paper. (合并为一句)
   There is a push-pin_____ _____ this piece of paper.
2. He has a factory. It has a hundred machines. (合并为一句)
     He has a factory _____ a hundred machines.
3. How much is a push-pin today? (改为同义句)
    What's_____ _____ _____ a push-pin today? /How  much_____a  push-pin         _?
4. It was his big success.(改为同义句)
   He was very _____.
5. In 1900,a push-pin cost  $0.01. Today it costs  $0.05.(合并为一句)
   A push-pin is_____ _____today than in 1900.