1. Some people believe that since oil is scarce， the ________ of the motor industry is uncertain.

　　A) terminal B) benefit C) fate D) estimate

　　2. To speed up the ________ of letters， the Post Office introduced automatic sorting.

　　A) treatment B) delivery C) transmission D) departure

　　3. These overseas students show great ________ for learning a new language.

　　A) enthusiasm B) authority C) convention D) faith

　　4. The defense lawyer was questioning the old man who was one of the ________ of the murder committed last month.

　　A) observers B) witnesses C) audiences D) viewers

　　5. Politically these nations tend to be ________， with very high birth rates but poor education and very low levels of literacy.

　　A) unstable B) reluctant C) rational D) unsteady

　　CBABA