Question

A frensh scientist named Dubois ...........g. (19) out that the glow-worm gave out a
flow because of a chemical. He called ............ (20) Luciferin. Later he found out that
Luciferin ....... (21) it self cannot give out light. It must act with another chemical ... (22)
he called Luciferase.
19.
A) finds
B) find
C) has found
D) found
20.
A) him
B) it
C) her
D) its
21.
A) of
B) with
C) by
22.
A) what
B) which
C) who
D) where
Turn Over​

Answer 1

1. found
2. it
3. by
4. which

Explanation:

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Answer 2

Answer:

19. D found

20. B it

21. C by

22. B which

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