Tìm một số biết:

a) 2 3  của số đó bằng 7,2

b) 1 3 7 của số đó bằng -5

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

The police tried in vain to break up the protest crowds in front of the government building; further measures needed to be employed.

A. unskillfully 

B. violently 

C. effectively 

D. eventually