Câu số 21:  

The word "that" refers to _______.

Câu số 22:  

Why does the author mention Edward Bellamy's novel Looking Backward?

Câu số 23:  

23:

Câu số 24:  

24:

Câu số 25:  

25:

Câu số 26:  

26:

Câu số 27:  

27:

Câu số 28:  

Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions.

Solar energy can also be used for day light, cooking, heating and helping plants grow.

Câu số 29:  

Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions.

The only structure remaining intact is the Flag Tower of Hanoi built in 1812 during the Nguyen Dynasty.

Câu số 30:  

Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions.

Music plays a crucial role in our live, therefore all too often it is taken for granted.