By the time my parents reached home yesterday, I _____ the dinner already.
| A．had cooked | B．cooked | C．have cooked | D．was cooked |
The teacher is busy ____ correcting papers.
| A．for | B．in | C．on | D．of |
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 |