The pair of shoes  __________ worn out.

Two-thirds of the land ________ covered with green grass and the rest _______ covered with pine trees.

One third of our school _________ covered by trees, while the majority of our students ________ girls. 

--Will there be fewer trees?   --_______________.

A study has found that 80% of the people who ______ to be constantly distracted ______ more “working memory”.