There are five pairs, but I'm at a loss which _____ to buy.
| A．to be chosen | B．to choose from | C．to choose | D．for choosing |
We left Xi' an _.___ a very hot summer afternoon.
| A．on | B．in | C．during | D．by |
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 |