What ____ the population of China ? —China has a population of 1.3 ____.

Mary has just got an invitation to theparty She is now in a __________ as to whether to go there in her old dress orto stay at home

(2009·陕西)Gun control is a subject ________ Americans have argued for a long time

I went along thinking of nothing,_____only looking at things around me.[ ]

Where were you at ten o’clock this morning—I ________ with my friends in the park at that time.