Mary was much kinder to Jack than she was to the others, _______, of course, made all the others upset.
Bill’s fully ____ from his heart disease. He is very happy.
While____the dog,you should take care not to____.Otherwise,it may be dangerous to strangers.
Tom ____ skating, so he spends all his spare time on it.
Having retired(退休), he ______ the club for old men and plays chess every day there.
Neither of them knows the difference ________ the two and neither can we tell one ________the other.