20．_____ their support for China’s adoption of the Anti-Secession Law, but many people on Taiwan island also thought it a necessary law to prevent the secession of Taiwan from China.

　　　 A．Not only many countries expressed　 　 B．Not only did many countries express

　　　 C．Not only expressed many countries　 　 D．Not only many countries did express

19．Joe Jones, the eldest of the eight children, had to _____ out of high school at the age of 16 to help his father on the farm.

　　　 A．leave　　 　　　　　　　 B．drop　 　　　　　　　　 C．fall　　 　　　　　　　　 D．go