Excuse me, I wonder if you can help me— Sure. ______

“Well done, John！ Not a single mistake _____ in your exam paper this time！”said the teacher

It is about 600 years ago ______ the first clock was made.[ ]

The old father ______ the project ten years ago but didn’t live long enough to complete it sohis sons and daughters ______ and are continuing doing it now.

It will be a long time ______-he returns.