—Do you know whose dictionary it is?—It ________ be Ann’s. Look! Her name is on the first page.

—Why are those people gathering in the middle of the street?—I don’t know. There ________ be an accident.

Being examined twice a year, whether it is a car or a bus or a truck, it is the rule that every driver____ obey in this city.

---_____book is this? --- I think it _____ Carla’s. It has his name on it.

-–Mary knows the city quite well.--She______ well have been there before.