A dog is a useful a_____
A dog is a useful a_____
A dog is a useful a______
1.The dog is a useful animal.
The little boy is a_____ of a dog.
a dog is a useful animal 的 a dog 要怎么解释为什么不是the dog
The dog is (a/an/the//) useful any more
_____computer is a useful machine.
English is a useful tool.
______(Dog)dog is ______ useful animal.
it is a dog
It is ( ) a dog?
live a dog is