Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century.

Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century.

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before

since

when

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A significant proportion of such children are condemned______.

#95175

fail

to fail

failing

failed

________ is of no concern to us.

#93464

It rain or not

If or not it rains

Whether it rains or not

Will it rain or not

________ seems to be a strong competition　in China for senior high students to enter college or university.

#93156

This

That

There

Kate, run a bit faster, ____ you can catch up with all of your classmates.

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and

but

How long ___ to finish the work ?

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will you take

you will take

will it take you

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