There’s no way of knowing why one man makes an important discovery _______

There’s no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.

#31181

since

while

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________ I’m __________ about the work. I’m not strong enough for it.

#32851

since…bored

however… exhausted

Not that… particular

Now that…tired

Some students even have no idea of　　　they are studying, so they are aimless most of the time.

#30606

who

when

where

why

—I'll call you ______ I arrive in Shenzhen． —Thanks, and good luck．

#31894

while

until

once

His parents were teachers in that school, _______ lost their lives in order to save their students in the earthquake.

#32666

none of them

both of them

none of whom

both of whom

— You should have prepared your speech for the meeting, Mr. Smith. — Yes, I know. But how could I _____ the meeting date fixed so soon?

#32218

while

after

with

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