I think you should think twice .Once ______, the decision won’t be easily changed .

That is the only way we can imagine ______ the overuse of water in students’ bathrooms. 

Now that we’ve discussed our problem, are people happy with the decisions _________?

______ that she was going off to sleep, I asked if she’d like that little doll on her bed.

While waiting for the opportunity to get    , Henry did his best to perform his duty.