Seeing the happy ______ of the mother and her baby playing on the grassland, I immediately took a picture of them.
When I went to the lake, my father was__________ fishing.
He is always full of __________ as though he has neverknown tiredness.
At present we have no __________ of life on otherplanets.
This book __________ ten units,__________ three main revision.
—I think arts are more interesting than science ones. —__________. I prefer science subjects.