-How was the English evening party last night?-It was great fun. You ______ come.

－Must we leave now?－No, we ________. We still have two more hours.

---Is the man over there Mr. Brown?----It ______ him. He has gone to Brazil to watch the 2014 FIFA World Cup.

– Who didn’t turn off the light after school yesterday?– It ______ be Lucy. She told me she was the last one to leave the classroom.

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