It’s management that’s at fault _________ the work-force.

Is that your uncle’s car—It ___ be his. He’s just gone for a meeting.

Exciting as its special effects are ______, there is too much violence in the film

My English teacher goes to school ___ hisbike.

If the researchers are successful, they an important step in reproducing the way that humans use cognition（认识力）to interact（交流；互动）in their world．