11. The engineers are going through with their highway project, ____ the expenses have risen.

A.     even though     B. just because        C. now that             D. as though

12.   She learnt how to cook by ____ and error.

A.     trial               B. attempt               C. action              D. progress

13.  Stressful environment leads to unhealthy behaviors such as poor eating habits, which ____

increase the risk of heart disease.

A.  in turn          B. in return             C. by chance         D. by turns

14.  His efforts to improve the school have been very ____.

A. operative        B. valid             C. efficient           D. effective

15.    I like to go to the cinema when I am in the ____ for it.

A.     motive         B. mind               C. mood            D. intention

16. Circus tigers, although they have been tamed, can ____ attack their trainer.

A. unexpectedly      B. deliberately        C. reluctantly        D. subsequently

The precious manuscripts were hopelessly _____ by long exposure in the cold, damp cellar.

A. ruined     B. damaged    C. destroyed     D. harmed

18. The board of the company had decided to _____ its operation to include all aspects of the clothing business.

A. extend    B. enlarge     C. expand      D. amplify

19. That sound doesn't _____ in his language, so it's difficult for him to pronounce it.

A. happen    B. occur     C. have       D. take place

20. The accommodation was cheap, but the food was very _____.

A. high     B. costly     C. dear       D. overpaid