(年北京市西城区高三5月二模试题)31. A person who has never tasted bitter won’t know ______ sweet is.
The lawyer rarely wears anything other than jeans and a T-shirt ______ the season.
Let’s learn to use the problem we are facing ______ a stepping-stone to future success.
The performance ______ nearly three hours, but few people left the theatre early.
—What fruit is in season now? —Grapes and peaches, ______.
—Would you like to join me for a quick lunch before class? —______, but I promised Nancy to go out with her.