1. E

correct usage of "since" ( A , E)

His correctly refers to chemist unlike other options (hence narrow down to E)


For me, E looks correct if I try to substitute it in sentence

2.

E ( Crisp and meaningful)

IMO A,A
What is OA

Explain your answer...

1- A
2-A

First question ,
eliminate B , C
it seems chemistry is following/after Robert
d- parrallism issue - critiquing all chemistry ....and also a vision[b]

e chemistry done since - incorrect usage .

[/b]

For Q16,
B, has a pronoun problem, its not clear whoi "HiS" refers to
c the second best chocie, although i think there is an idiom error here "as well"

D, crtiques only chemistry done by Robert Boyle. changes the meaning of sentence.
E is wordy and has pronoun refrence problem

Answer should be A. Critique , is correctly modifed by the phrase before it. the word "Since" is also used correctly here

for Q17,

I would say correct answer should be B. (Possesive Pronoun issue + subjunctive clause)

A. Creates a passive voice here
C. Uses "are" in the sentence.
D,E. That should be used here instead of

16
I will go with A

B
and also his envisioning of a .........incorrect

C
envisioning as well new chemistry..... looking incorrect

D
and also a vision .........incorrect

E
chemistry done since RB...............wrong

17
A for this one too


B
we are not talking about using the names
the problem is persons do not want to get named

C
again names are not used

D
not having their names is weird and incorrect

E
not naming them...

OA for both is A.
Stop ...can u pls explain the first 1

The second part is a modifier describing "Essay..." -- it is a critique and also a vision of Davy.

These questions are so old that bad smell is coming out. First one tests concept of appositive and parallelism, second one tests subjunctive.