Mark the letter A, B, C or D on your answer sheet to indicate the underlinedpart that needs correction in each of the following questions from 21 to 23.

Air pollution, together with littering, have been causing many problems in our large, industrial cities in the last few years

A. with

B. in our large

C. many

D. have been

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

Air pollution, together (A) with littering, (B) have been causing (C) many problems (D) in our large, industrial cities in the last few years.

A. with

B. have been 

C. many 

D. in our large 

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

Air pollution, together (A) with littering, (B) have been causing (C) many problems (D) in our large, industrial cities in the last few years.

A. with 

B. have been

C. many 

D. in our large

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

Air pollution, together (A) with littering, (B) have been causing (C) many problems (D) in our large, industrial cities in the last few years.

A.with

B.have been

C.many

D.in our large

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.

Air pollution, together with littering, are causing many problems in our large, industrial cities today.

A. with

B. in

C. are

D. industrial

Mark the letter A, B, C or D on your answer sheet to indicate the underlinedpart that needs correction in each of the following questions from 21 to 23.

They are planning on attending the convention _______ next month, and so I am

A. so I am

B. and

C. planning

D. on attending

Mark the letter A, B, C or D on your answer sheet to indicate the underlinedpart that needs correction in each of the following questions from 21 to 23.

They are planning on attending the convention _______ next month, and so I am.

A. so I am

B. and

C. planning

D. on attending

Mark the letter A, B, C or D on your answer sheet to indicate the underlinedpart that needs correction in each of the following questions from 21 to 23.

According to geological discoveries. 4.6-billion-vears life span of our planet is divided into four time intervals called eras

A. geological discoveries

B. 4.6-billion-years

C. is

D. into