—I rang you at about nine，but there was no reply．—Oh，that was probably I was seeing the doctor．

—I rang you at about nine，but there was no reply．—Oh，that was probably        I was seeing the doctor．

#30192

why

when

what

that

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He never thought that his success came ______ he least wanted it.

#31348

until

since

when

while

______ you make a promise, you should keep it.

#32584

Though

Unless

Now that

Even if

Now there is just one point   I wish you to make clear.

#33039

where

that

when

what

A model or an experiment in a science class can help students see things which would ______ remain hidden.

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otherwise

still

thus

therefore

____ he works hard, I don’t mind when he finishes the experiment.

#31570

As soon as

Even though

So long as

So far as

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