After a series of researches, they finally ___ that the pollution was the leading factor contributing to the death of the creatures in the river.
—Would you be able to go to the party?
—Are you coming to the English evening? —I'm not sure. I ________ go to the concert instead.
Hearing his words, I couldn't decide ______ or remain.
—This is _________ picture I told you about. —I see. Isn't it ________ beautiful one?
Parents will surelytheir children.