(1)May I have your attention, please?

(2)Attention, please. I have something important to tell you.

(3)Attention please, everyone. I have an announcement to make.

(4)There will be a book fair to be held in the city square next Sunday.

(5)There will be an exhibition of oil paintings, where you can see many works by masters.

(6)The student union has decided that we will pay a visit to the History Museum this afternoon.

(7)It has been decided that we'll take a trip to an exhibition to be held in the city museum.

(8)Come here on time and bring a pen and a notebook with you.

(9)Do not ask for leave without special reasons.

(10)No photos or food and drink are allowed in the museum.

(11)All teachers and students are required to attend.

(12)Please come on time.