帮我看几道英语选择题需要正确率

帮我看几道英语选择题需要正确率
A:Do you want to drive?
B:No.I don't know the way to the lake.______ Olga is the one who knows how to get there,she should drive,don't you think?
Even though
Whether or not
Only if
Since
A:This morning I knew winter was finally over when I heard birds singing in the garden.
B:Yes,and _______ spring has arrived,there are signs of new plant life everywhere.
while
now that
in the event that
if
A:What's this?Where did you get such an expensive glass vase?
B:Aha.It fooled you.It's not glass.It's a strong,new plastic that looks and feels just like glass,but it doesn't act like glass.This vase won't break _______ you drop it on a hard floor.Try it!Just drop it and see what happens.
even if
unless
only if
in case
A:Why are you so sure that Sammy will get the job?More than fifty candidates have applied for it.
B:He's had so much experience.I think he'll get it _______ he is uniquely qualified.And he makes an excellent first impression.
because
if
now that
even if
A:Look!The restaurant is closed!What a surprise!
B:Well,_______ we're here,let's find another restaurant nearby.
whether or not
after
by the time
now that