Mary encouraged me x .

A. to try my best, otherwise I would pass the exam 

B. to try my best so that I could pass the exam 

C. trying my best and I could pass the exam 

D. to try my best so that I can pass the exam

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) that is OPPOSITE in meaning to the underlined part in each of the following questions.

Names of people in the book were changed to preserve anonymity.

A. reveal    

B. conserve  

C. presume  

D. cover

Giải hệ phương trình  2 3 x   +   1 2 y   =   2 3 1 3 x   -   3 4 y   =   1 2