15.You may ________ the textbook if you don’t know the answer to the question.
Facing the ________situation, the boss of the company looked____. A. puzzling, puzzled B. puzzling, puzzling C puzzled, puzzled D. puzzled, puzzling
As we all know, _________ car is becoming _________ popular way of transportation in big cities.
The climate is changeable in this area. You should prepare more clothes ___________ the sudden change of weather.
Any behavior that is repeated enough times will ________ become a habit and happen automatically.
The two newspapers have offered ______ views as to the same issue, which means they take different stands.