—The window is dirty.—I know. It ______ for weeks.

I want to change my desk. It _______too much room.

 By the time he was twelve he ______ a chemistry lab of his own.

The young _____eaten up almost everything ,and one and a half bananas ____ left on the table.

— Oh no! We’re too late. The train _______. — That’s Ok. We’ll catch the next train to London.