One-third of the area ________ covered with trees. About seventy percent of the trees _______ been planted recently.

 The number of people visiting the exhibition ______ 50, and a number of them ____ painters.

Nothing but one desk and six chairs ________ in the room.

 Every boy and every girl in our school _____ to join one or two clubs according to their hobbies.

The brown trousers _______ 70 dollars. And that white pair of trousers _______ 80 dollars.