She wanted to tell him that she didn't want to do that, but she didn't know how to ________ it.
That's not a match; we're playing chess just for _________.
Last Sunday he promised _________ today, but he hasn't appeared yet.
At that time I had no idea _________ I could hand it to him without being seen.
Now there is a danger _________ the ground may fall under the heavy traffic.
We think it possible _________ the local government will be able to solve the housing problem.