2011英语四级词汇语法练习题第2组_第3页

　　11. The firms are not allowed to set up any trade ________ among them.
　　A. barrier B. blame C. benefit D. duty

　　12. The street was ____________ by the police for fear that there was a bomb.
　　A. deceived B. delivered C. damaged D. blocked

　　13. The economy in this city was _______ by the new investment from abroad.
　　A. cancelled B. boomed C. buried D. crowded

　　14. On _______ of the school, I’d like to welcome you all.
　　A. behalf B. dairy C. decade D. delight

　　15. He is a ______ boy because he was not afraid of fighting with the bad man.
　　A. damp B. delicate C. cruel D. bold