Is there a girl here with the name of Mary?（改为同义句）

Detective Ma and Detective Pang also investigate other crimes. They are showing pictures of different crimes to the students. Complete what the detectives say.

The most difficult case we had was about a ________. The ________ was a 40-year-old man, who killed 10 people.

Detective Ma and Detective Pang also investigate other crimes. They are showing pictures of different crimes to the students. Complete what the detectives say.

One day, we got a call from a CD shop. They reported that there had been a ________ in their shop and over 10 CDs were missing. The ________ only went for the classical music CDs.

Detective Ma and Detective Pang also investigate other crimes. They are showing pictures of different crimes to the students. Complete what the detectives say.

At one time, a rich businessman in New York reported to us about a ________. His son was kidnapped and the ________ asked him for one million US dollars.

Detective Ma and Detective Pang also investigate other crimes. They are showing pictures of different crimes to the students. Complete what the detectives say.

The most common crime is ________. The ________ steal everything from TV to cars.

Complete the dialogues using‘why not’,‘why don't you’and‘perhaps’.

　　Billy: I got low marks in my Maths exam again. ________ I should pay more attention in Maths class.

　　Denny: ________ join our study group? We study for an hour in the library every day after school.

　　Billy: That's a good idea.