He asked _______.
When taking an examination, we are usually not allowed to __________ dictionaries for the words we don't understand.
Every possible means __________ to prevent the air pollution, but the sky is still not clear.
You know Australia is a big country, but you may not know how easy it is to __________.
Chinese TV host Xie Na and singer Zhang Jie held their wedding __________ on Monday in Shangri-La.
Standing at the top of the hill, we saw the train gradually __________ and disappeared in the distance.