How soon can you finish the work? –We can finish it in 20 minutes if we have one more person ________ us.

The air in Lanzhou is getting much _____ now than a few years ago .

My father is _______. And we just had a party for his _______ birthday last weekend.

____ is Mary?—She is five.[ ]

During the reconstruction of the city , many modern tall building went up old shabby houses were torn down.