Asia is important to America because America's prosperity ________ trade with Asia's growing economies.

1. A.
   depends on
2. B.
   takes off
3. C.
   sets up
4. D.
   breaks out

Asia is important to America because America's prosperity ________ trade with Asia's growing economies.　　

A．depends on　　 B．takes off　 C．sets up　　　 D．breaks out