Câu số 41:  

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

It is not until a Vietnamese girl getting 18 years old that she is allowed to get married legally.

Câu số 42:  

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

It is over twenty years since I last got in touch with them.

Câu số 43:  

What does the passage mainly explain?

Câu số 44:  

According to the passage, helium is              

Câu số 45:  

The word "constituents" is closest in meaning to        

Câu số 46:  

Why does the author mention "cosmic rays"?

Câu số 47:  

The word "they" refers to            

Câu số 48:  

The word "vary" is closest in meaning to            

Câu số 49:  

The creation of helium within stars             

Câu số 50:  

Most of the helium in the universe was formed