Mark the letter A, B, C or D to indicate the mistake in each of the following sentences and correct it

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Task 3. Mark the letter A, B, C or D to indicate the mistake in each of the following sentences and
correct it.
1. Our school organised a field trip for visit the Trang An Scenic Landscape Complex last summer.
C. for visit
D. Complex
A. organised
B. field
2. Visitors don't need to pay any fee before enter Hoi An Ancient Town in Da Nang.
A. to pay
B. before
C. enter
D. Ancient
3. The local community has made efforts to preservation their traditional folk singing and folk dancing.
B. preservation
D. dancing
A. made
C. their
4. The floating market boats are an interesting way to explore the local culture and buying fresh products.
A. are
B. to explore
C. culture
D. buying
5. The non-profit organisation focuses on to protect the wildlife and ecosystems in this area.
B. focuses
C. to protect
D. ecosystems
A. non-profit