Question

N. Tick the groups of words that are the subjects of the sentences.
1. An American astronomer named Clyde Tombaugh discovered Pluto in 1930.
An American astronomer named Clyde Tombaugh
b. An American
c. discovered Pluto in 1930.
a.
2. For more than 70 years, Pluto was one of nine planets recognised in our solar system
a. For more than 70 years
b. Pluto
Pluto was one of nine planets
3. But in 2006, the International Astronomical Union demoted Pluto to the status of a dwarf
planet.
a. But in 2006
b. the International Astronomical Union
c. the status of a dwarf planet
4. In the years that followed, scientists started to wonder if Pluto was just one of several small
icy bodies that were discovered beyond Neptune.
18​

Answer 1

Answer:

1.b

2.a

3.b

4.

where was 4th option