However, at times this balance in nature is disturbed,_____a number of possibly unforeseen effects.[ ]

Tom’s sister didn’t do the dishes, she thought she should take ______/ke(r)/ of her hands.

Please give me some _______.

1—Whatcolor_____ the cats—I think________white and black.

I went to your home at 4 pm yesterday, but nobody was in.— Oh, I football with my friends in the park then.