Find a mistake in the four underlined parts by circling A, B, C or D of each sentence

Find a mistake in the four underlined parts by circling A, B, C or D of each sentence.
(Tìm 1 lỗi sai trong 4 phần gạch chân ở mỗi câu bằng cách khoanh tròn A, B, C hoặc D)
20. Han lives in an cottage house in Cuc Phuong national park.
A. lives
B. an
C. in
D. national
21. What he detests to do is going to work at weekends.
A. to do
B. going
C. to work
D. at
22. Playing team sports gives you much fun than individual sports.
A. Playing
B. gives
C. much
D. individual
23. I love farm work, such as digging holes, sowing seeds and pick fruit.
A. farm work
B. digging holes
C. sowing seeds
D. pick fruit
24. Who songs is this singer performing? He is performing Trinh Cong Son’s songs.
A. Who
B. is
C. performing
D. Trinh Cong Son’s