A container holds 240 bicycles; the whole cargo would therefore comprise 50 containers, （） 8 tons.  

单项选择题Please （） your L C validity till June 2, 2006.

A.extent           
B.extend        
C.expand          
D.effect extension for

单项选择题Our payment terms are （）, irrevocable letter of credit for the full invoice value.

A.combined
B.confirmed
C.committed
D.completed