Please help me to correct my anserw below.thank you

Question

Petroleum, or crude oil, is one of the world's (1) _____ natural resources. Plastics, synthetic fibres, and (2) _____ chemicals are produced from petroleum. It is also used to make lubricants and waxes. (3) _____, its most important use is as a fuel for heating, for (4) _____ electricity, and (5) _____ for powering vehicles.

1. a. as important
b.so important
c.too important
d.most important
ans.d

2. a.much
b.plenty
c.less
d.many
ans.d

3. a.Therefore
b.Moreover
c.Hence
d. However
ans.b

4.a.generated
b.to generate
c.generate
d.generating
ans.b
5. a.specially
b.exclusively
c.notably
d. especially
ans.d

Answer 1

1, 2, and 5 are correct. 3 and 4 are wrong.

Answer 2

1- d
2- d
3- b
4- c
5- a

Answer 3

1. d
2. d
3. d
4. d
5. d

Answer 4

A.most important
B.many
C.however
D.generating
E.especially