If you don’t keep your words all the time , your best friends won’tyou any more .

Do you mind my taking this seat?—_______________.

Although he is five years old, he has learned more than twenty old Chinese poems_____ heart.[ ]

How was your trip to New York, Jennifer? — Fantastic! That was the first time I _______ to such a big city. It’s so impressive.

In his lecture, the professor referred to the belief, in contrast to all other countries, ______the elderly are wise, ______is particularly dominant in the Chinese culture．