Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

David seems really ill at case in front of all those people.

A. David feels uncomfortable in front of all those people.

B. David is easy to be ill because of all those people.

C. David is ill because he stands in front of all those people.

D. David fells comfortable in front of all those people.

Mark the letter A, B, C or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
Question 2:

A. literature

B. important

C. available

D. conservation

Ta có /20a20a20a = /20a*1000000 + /20a*1000 + /20a 
= /20a*(1000000 + 1000 + 1)=/20a*101001 do101001 không chia hết cho 7 
nên /20a chia hết cho 7mà /20a=2*100+a=200+a=203-3+a 
203 chia hết cho 7 
=> a-3 € B(7) = {0; 7; 14 ...} mà 0≤a≤9 
nên a-3 = 0 
Vậy a = 3