_______ are your keys——They’re on the bed.

Excuse me. Are these Mary’s exercise books—Sorry. They are _______ exercise books. _______ are on the teachers’ desk.

The unemployment rate in this district from 6% to 5% in the past two years

There ________ a wonderful concert in Beijing Theater tomorrow.

Although he knew little about the work done in thefield, he succeeded ____other more experienced experimenters failed.