Choose the best option to complete the sentence

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Exercise 7: Choose the best option to complete the sentence.
1. If I
her phone number, I
her last night
A. had known/ could have phoned
B. knew/ would have phoned
c. know/ can phone
D. knew/ could phone
2. If he_
the truth, the police wouldn't arrest him.
A. tells
B. told
C. had told
D. would tell
3. If you press that button what_
A. would happen
C. will happen
?
B. would have happened
D. happen
4. She says if she_
that the traffic lights were red she
A. had realized/ would stop
B. realized/ could have stopped
c. has realized/ stopped
D. had realized/ would have stopped
5. I am very thin. I think, if I
B. had stopped
smoking, I might get fat.
A. stop
C. will stop
D. stopped
6. If I_
that yesterday, I
them.
A. had discovered/ would inform
B. had discovered/ would have informed
c. had discovered/ could inform
D. discovered/ can inform
7. If you_
to the course regularly, they_
a certificate last year.
A. go/ gave
B. go/ give
c. had gone/ would have given
D. went/ would give