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

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Question 21. Mark the letter A, B, C or D on your answer sheet to indicate the underlined
part that needs correction in the following question.
The number of vehicles on the roads has dramatic increased, which leads to many car crashes.
A. on
B. has
C. dramatic
D. leads to
Question 22. Mark the letter A, B, C or D on your answer sheet to indicate the underlined
part that needs correction in the following question.
The students in the 1980s learnt more well than in the 1970s.
A. in the
B. learnt
C. more well
D. the
Question 23. Mark the letter A, B, C or D on your answer sheet to indicate the most suitable
response to complete the following exchange.
Mai: Why don't we collect the photos taken in the 1975s?
Nick: "
A. How come!
B. It is a great idea!
C. Don't mention it.
D. Not at all.
Question 24. Mark the letter A, B, C or D on your answer sheet to indicate the most suitable
response to complete the following exchange.
Phong: "I am really grateful. Thanks for helping me."
Nam:
A. Don't mention it!
B. That's great!
C. Go ahead!
D. I can't imagine that!