_______ he was seriously ill, I wouldn’t have told him the truth.  
#87834
A
If I knew
B
If I know
C
Had I known
D
Did I know
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 I really don't know how to thank you, but for your help, I ________ my lost necklace.
#86411
A
couldn't have found
B
mustn't have found
C
couldn't find
D
wouldn't find
We were anxious about you.You    home without    us.
#86951
A
shouldn’t leave; tell
B
mustn’t leave; tell
C
shouldn’t have left; telling
D
can’t have left; telling