No matter how frequently _______, the works of Beethoven still attract people all overthe world.

"It's a such nice place," Mother said as she sat at the table________ for customs.

The Diaoyu Islands have been part of China’s territory since ancient times, __________ as important fishing grounds of Taiwan.

Dad is under a lot of pressure, so we have to ________ him.   

In the near future, China will increase supply of smaller houses,       to help low-income families to buy houses of their own.