---Look! Such heavy traffic!--- I doubt _________ or not I can get to school on time.

 ---Look! Such heavy traffic!--- I doubt _________ or not I can get to school on time.

#56179

when

whether

why

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David doesn’t give up _______ he has failed in the experiment four times.

#57463

while

though

since

We can go hiking next week ____ it rains heavily.

#57235

unless

though

because

---When did you return to China?---_________________.

#56057

Until next week

Not until next week

a few days ago

for a few weeks

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#57634

for

______ he became seriously ill, he still went on working.

#58164

Unless

And

Even though

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