---A: Sorry, I didn’t return your book on time.---B: _______.
—How much difficulty did you have this problem? — .
—It’s dangerous to walk across the street carelessly.—You’re right. We can’t be _________ careful while crossing the street.
—Have you _________ the invitation of Lily’s birthday party?—Yes, but I won’t _________ it. I don’t have any time on that day.
— Must I finish the work now?—No, you __________. You __________ do it this evening.
—What do you think of your presents for Mother’s Day? —Well, _________ this sweater that one fits her. They are too big.