球在哪里?在狗的前面。
Where is the ball? It's ___in ___front ___of the dog.
这本书的封面是蓝色的。
The cover ___of the book is blue.
这个杯子是玻璃做的。
This cup is made ___of glass.
这座建筑建于20世纪80年代。
This building was constructed in the 1980s ___of the last century.
她是班上最优秀的学生之一。
She is one ___of the top students in the class.