Raising environmental awareness was the aim of our art exhibition ____ last week.

.Opening the book, she found in it a white, plain envelope with her name ______ on it.

The wild flowers looked like a soft orange blanket _______  the desert.

There were two teachers named John ________at our school, which made some of our students _____.

.Whenever you enter the reading room, you can find all the students _____ at their desks, with their attention _____ on the books, except Tom.