_______ with a difficult situation, Arnold decided to ask his boss for advice.
Old people need special care in winter, as they are very______ to sudden change of the weather.
--- Let’s go to play football, shall we? --- Sorry, I can’t. I must go over the points the teacher explained ______ I forget them.
You may not understand what they have done, because they ____ a younger generation.
Misunderstanding may ______ if people fail to communicate with each other.
My friend Martin was seriously affected by a strange fever; _____ , he could neither eat nor sleep.