–Amazing!You ____________ wear slippers at work–Don’t you know it’s a fashion

It was not until dark ______ he found ______ hethought was the correct way to solve the problem

Why the explosion occurred was____the laboratory attendant had been careless

It is reported that it will rain hard nextSunday.—.We’re planning to go boating that day.

I went to see my friends off at the airport.—Is that_____you were late for the important meeting?