I was really anxious about you. You____ home without a word.

— Who’s that man over there standing in the garden? Is it Mr. White?—It __________ be him. He has gone to Shanghai on business. 

So many people violate traffic regulations that we ____ put too much emphasis on the importance of traffic safety. 

This printer is of good quality. If it ________ break down within the first year, we would repair it at our expense.

We ________the difficulty together, but why didn’t you tell me?