Anyone whose performance is best received by the public____ be given an opportunity to show their talents at the Great Hall of the People in Beijing.

—Jim，you said you'd lend me your MP5.—I'm sorry I forgot my promise but you ________ have it next Saturday. 

——Who’s that man? Is he Mr. Brown?——That    be Mr. Brown. He never walks this way.

It is usually warm in my hometown in March, but it ____be rather cold sometimes.

(2013·湖南长沙四校二模)—Is the letter from your mother?—Yes.But she ________the letter herself，because she doesn’t even know one word.