Hi, Help me in finding out answes

If I didn't check my email every day, I ________ many important messages from the international sales team.

(A) didn't see
(B) wouldn't see
(C) won't have seen
(D) can't see

We tried to install a natural vent system, but after
A
installation the system failed functioning
B C
correctly .
D


(A) to install
(B) installation
(C) functioning
(D) correctly

A: Were you aware that Alice was terminated because of her previous employment?
B: Yes, I was very shocked by the news. _______ that kind of injustice.

(A) I feel a contrast to
(B) I am strongly agreeing with
(C) I am opposed to
(D) I can occasionally dispute in

I have already eaten when she arrived.
A B C D


(A) have
(B) already
(C) eaten
(D) when

I ________ telephone messages for the chairman several times since he called.

(A) have left
(B) was leaving
(C) have been leaving
(D) left