Wind power is an ancient source of energy _____ we may return in the near future.

Wind power is an ancient source of energy _____ we may return in the near future.

#33026

to which

by which

from which

on which

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Tom eagerly findished up ________ was left of the chicken pie.

#30327

what

that

which

where

—Someone wants you on the phone.—________ nobody knows I am here.

#30230

Although

And

But

Is it the fact ____ he hasn’t turned in his research report?

#32327

whether

that

which

why

 It is by no means clear ________ the president can do something to end the strike.

#30079

whether

which

that

what

It was some time       we realized the truth．

#30839

when

until

since

before

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