Everyone has his or her advantages, and only _______ you do best can help to reach the goal and truly make a difference.
Former IOC (the International Olympic Committee) president Samaranch’s death is believed ____ by heart attack.
It is suggested that he _______ a doctor at once.
_____ I failed in the examination again drove my mother mad.
26. –Look! How terrible his situation is! Could you help him? --I’d like to help, but ____ I can’t.
I don’t know if he ____, but if he ____ I will let you know.