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

They have carried out exhausting research into the effects of smartphones on schoolchildren’s behaviour and their academic performance.

A. exhausting 

B. into 

C. behaviour 

D. academic performance.

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

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

Hardly he had graduated from Vietnam Naval Academy when he joined Vietnam Coast Guard.

A. he had    

B. graduated from  

C. when       

D. joined

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

The world is becoming more (A) industrialized and the number of animal (B) species that have becoming (C) extinct (D) have increased. Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

A.  industrialized

B. species

C. extinct

D. have

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

In recent years (A) great advances forward (B) have (C) been made in the field of genetic research.(D)

A. In recent years

B. forward

C. have

D. genetic research

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

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

We planned to visit Ba Na Hills in the afternoon. We could not afford the fee, however.

A. As planned, we could not afford the visit to Ba Na Hills in the afternoon because of the fee. 

B. We visited Ba Na Hills in the afternoon though the fee was too high for us. 

C. We were going to visit Ba Na Hills in the afternoon, but the fee was too high for us. 

D. The fee was, however, high enough for us to plan a visit to Ba Na Hills in the afternoon.

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

We should (A) also take into account (B) a fact (C) that unemployment (D) causes poverty.

A. also 

B. a 

C. that 

D. causes 

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

I think we have sufficient enough  information to write the report.

A. sufficient enough  

B. information

C. write

D. the report

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

A recent research shows that walking (A) for even (B) twenty minutes a day (C) can have significance (D) health benefits.

A. walking 

B. even 

C. a day 

D. significance