Tom says he ______ you and is helping you with the research at present.
| A．had called on | B．will call on |
| C．has called on | D．called on |
The teacher is busy ____ teaching.
| A．with | B．for | C．on | D．of |
____ the sun, nothing would grow.
| A．For | B．With | C．Under | D．Without |
Our bus drove ____ the Great Hall of the People.
| A．across | B．through | C．past | D．over |
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 |