Please Check the Grammetical mistake in below

Hi Clive / Mister / Experts,

I have already provided the answers only need to verify the experts... thanks in advance

1. We should have had the car to be repaired at the shop before
A B
trying to sell it.
C D

(A) should have
(B) to be repaired <----
(C) trying
(D) to sell

2. The deadline dates for the construction ________ by the architect.

(A) have changed <----
(B) was changed
(C) have been changed
(D) was being changed

3. The marketing strategy what was used for so long
A B
was finally rejected outright by the stockholders.
C D
(A) what <---
(B) for so long
(C) was
(D) outright

4. I really look forward for studying Japanese to prepare
A B C
for my trip to Tokyo.
D

(A) look forward
(B) for studying <-----
(C) to prepare
(D) for my trip

5. He ________ in so much trouble last week if he'd followed the guidelines more carefully.

(A) hadn't been
(B) wouldn't have been <----
(C) might have been
(D) wouldn't be

6. Joyce: Aren't you going to Shanghai for the conference? Ronnie: Yes. At this time tomorrow, I ____________ across the Pacific Ocean!

(A) would be flying
(B) am flying
(C) will be flying <----
(D) would fly

7. The work ________ in the next day or two.

(A) is going to complete
(B) will have completed
(C) has been completed
(D) will be completed <----

8. A: Does anyone have an issue with this policy?
B: I _______________ about it.

(A) propose to publish an article
(B) have to agree
(C) have ethical questions <---
(D) enthuse

Regards
Hrithik