Nowhere in nature is aluminium (铝) found free, owing to (由于) its always____with other elements (元素) most commonly with oxygen.[ ]

Honey, stay outside and ______ a few minutes; then we’ll go to church together.

I guess Lucy can enjoy ________ at the dancing party.

Every year many foreigners ______to China to learn Chinese.

For some time the expert __________ people of the health risks caused by passive smokingHe says he won’t stop until all the smokers around him decide to quit smoking