—Why are the tax collectors so busy?  —Many people prefer to have their tax forms completed by a professional rather than ___. 

  He must have finished his homework for a long time, _____ he?

All the government leaders and policemen in Thailand must see to ______ that every citizen should stay safe and sound in the terrible flood.

--- How was your trip to New York, Jennifer? --- Fantastic! That was the first time I _______ to such a big city. It’s so impressive.

“______,” the soldier screamed loudly, who held a gun in his hands, “or I will shoot again!”