28. The farm as well as its neighboring hills we once spent so much time ____ on a new look as recently as last year.
_________ energy are abused in our daily life, only causing waste.
He being a child of ________ intelligence,expecting too much of him will make him nervous.
We should think hard ________ human activity has caused greenhouse effect.
The date for the next round six-party talk ________ but whether progress will be made remains ___________.
If I can help_______, I don't like working late into the night.