The books mainly deal with the trouble teens might have _________ right from wrong.
The research project has only been______for three months, so it’s too early to comment on its success.
A night in a hotel in Shanghai costs ______ a week in some faraway cities.
---Are you going to Tom’s birthday party? ---_________.I might have to work.
______ expense, we must take every measure to save the old man’s life.
_________all of them are strong candidates, only one will be chosen for the post.