下列句子中，传统礼貌用语使用正确的一句是（ ）

ere abroad during the months when we were carrying out the investigation, or they _____ to our help.

In the country guests tend to feel they are not highly__________ if the invitation to a dinner party is given only three or four daysbefore the party date

______ about his own safety, though he was ingreat danger himself.

Would you like _____ camping with me—- I ’d like to. But I’m busy _____ my homework.