---Little Tom got an “A” in the exam.--- ___ he’s been so happy these days.
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 in under the heavy traffic.
We think it possible ________ the local government will be able to solve the housing problem.
She took it for granted ________ I'd be back home an hour ago.