Write 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

Write 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.
Question 19: He has take part in the activity twice.
C. in D. activity
A. He B. take
C. learn
Question 20: Many students will try to learn English at present.
A. English B. will try
D. students
Question 21: London have a population of eight million people.
A. a B. have C. of D. population
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