Table:
0
A
B
C
D
E
1
Continent
Structure
Height
Year
Country
2
Asia
Burj Khalifa
m (ft)
2009
United Arab Emirates
3
Africa
OMEGA transmitter Chabrier
m (ft)
1976
Réunion (France)
4
North America
KVLY-TV mast
m (ft)
1963
United States
5
South America
Omega Tower Trelew
m (ft)
1971
Argentina
6
Europe
Warsaw radio mast
m (ft)
1974
Poland
7
Oceania
VLF transmitter Lualualei
m (ft)
1972
United States (Hawaii)

Questions and formulas:
Question: The year 1974 has what listed as the Height?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1=1974),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,D2:D7=1974),3))
Level: medium
Question: The OMEGA transmitter Chabrier has what country listed?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="omega transmitter chabrier"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,B2:B7="omega transmitter chabrier"),5))
Level: medium
Question: Listed with a continent of Africa and before 2009 this structure is called what?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1<2009)*(A1="africa")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(D2:D7<2009)*(A2:A7="africa")),2))
Level: medium
Question: The year 1972 has what written in Height column?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1=1972),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,D2:D7=1972),3))
Level: medium
Question: What is the Continent that also has the United States listed as a country?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="united states"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,E2:E7="united states"),1))
Level: medium