—Has Mary finished writing her article?—No, it ________ before class was over.
The design isn’t successful unless it ________ people of all ages and social groups.
“Isn’t it time you ________ down to _______something useful?” said his mother.
. I became more and more excited, trying to work out _______ Mom was taking us on holiday.
Medicine shouldn’t be kept _______ it is accessible to children.
_____ to Beijing, I would visit the Forbidden City where the emperors once lived.