I’m always ________ about what I say because careless remarks are likely to hurt others’ feelings.

Everybody said it was a perfect marriage; no one had ever known________couple.

Mrs.Brown is supposed _________ for Italy last week

Bob, why do you stay silent? Can you tell me the answer?— I’m sorry, Mr. Green. Your question is very difficult ________.[ ]

Did you hear that Tonna took social management as her major?—Yes,but she shouldn’t have,you see.This kind of subject ________one’s communication ability,and that’s what she is most weak at.