PleaseEvaluate these grammer question

1.The orientation video ____ to cover all of our service areas.

(A) aren't long enough
(B) is too long
(C) is so long
(D) isn't long enough

ans (D) isn't long enough

Find mistake

2.We are currently in search of a new online marketing specialist
A B
who is effective highly in search engine optimization.
C D

(A) are currently
(B) of
(C) who is
(D) effective highly

ans (D) effective highly

3.
A: So, what was your impression of the meeting?
B: Well, after some additional conversations with management, I was completely sold. I'm _______.

(A) afraid I can't give it my backing
(B) fully in favor
(C) opposed to the idea
(D) not surprised in the least

ans (B) fully in favor

4.The building manager asked the tenants ____ careful.

(A) are
(B) to be
(C) being
(D) be

ans (B) to be

5.A: I asked Chandra if we'd have to redesign the entire plan. What do you think she said?
B: That if you'd have asked her earlier, she ______ yes. But now, it was out of the question.

(A) wouldn't say
(B) couldn't have said
(C) would have said
(D) had to say

ans (C) would have said

6.
Shu wasn't the first employee in the office today, ___ he was the one who turned on the lights.

(A) and
(B) in spite of
(C) but
(D) so