At times ,worrying is a normal, ________response to a difficult event or situation—a loved one being injured in an accident , for example.

 Your job here is only _____, for you will be removed from it when we have a proper post for you． 

—What do you think of the play?—Terrible! I’ve never seen _________ one. 

 Allen had to call a taxi because the box was ____ to carry all the way home. 

It is important to keep ______ in an emergency (紧急情况).