Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
It is difficult to imagine his ______ the decision without any consideration.
It is worth considering what makes “convenience” foods so popular, and ______ better ones of your own.
Bill suggested ______ a meeting on what to do for the Shanghai Expo during the vacation.
I still remember ______ to the Famen Temple and what I saw there.
Planning so far ahead _____ no sense — so many things will have changed by next year.