— Why does the boy keep crying?
— It is ______ he has lost his favorite car model.
| A．since | B．so | C．when | D．because |
I was wandering ____ the streets when I caught sight of a tailor's shop.
| A．across | B．through | C．by | D．past |
We walked ____ the Tian An Men Square to the Museum of Chinese History.
| A．across | B．through | C．by | D．past |
The plane flew ____ the city.
| A．across | B．past | C．through | D．over |
1 heard ____ the book long ago, but I have never read it.
| A．out | B．from | C．of | D．with |
Do you often hear____ your brother?
| A．of | B．from | C．out of | D．about |