6.
(1) A lot of parents are concerned about their children's grades ________ their health.
(2) The new act was passed with over 80% ________ it.
(3) ________, I think cloning technology, if controlled properly, will benefit human beings.
(4) You must ________ if you want to leave early.
(5) The time he spends on sport ________ five hours a week on account of his business.