16. A who ( thay cho chủ ngữ chỉ người )

17. D that ( thay cho vật "everything" )

18. B which ( that cho vật "tornadoes" )

19. D foot ( the foot of the mountain: chân núi )

20. B who ( thay cho chủ ngữ chỉ người )

II

1. Paris is the best place for many people to spend their holiday.

2. Most tourist go there for the Eiffel Tower and they want to take various types of recreation nearby the Eiffel Tower.

3. Many artists find inspiration for their works in Paris.

4. Paris is also a wonderful place to take photographs with the magnificence of the city 

16,A

17,D

18,B

19,D

20,B

Who:đại từ quan hệ chỉ người.

Which:đại từ quan hệ chỉ vật.

That: đại từ quan hệ chỉ cả người lẫn vật

Where:đại từ quan hệ chỉ nơi chốn.

Whom:dùng khi có 2 tân ngữ

1,The best place for many people to spend their holiday is Paris.

2,The main reason for people going to Paris is the Eiffel Tower.

3,Many artists find in Paris inspirations for their works

4,Paris is a wonderful place for taking photographs with the magnificence of the city.