---How often do you visit your father in the village?
---I feel ashamed．Just__________．
| A．often | B．by accident | C．once in a while | D．all of a sudden |
Scientists have shown that there is a connection ____ cigarette smoking and certain diseases.
| A．with | B．between | C．to | D．on |
Most of the universities in China provided scholarships for students ______ financial aid. 
| A．in favor of | B．in honor of | C．in face of | D．in need of |
In the experiment the scientist kept a watchful eye________the developments and recorded every detail.
| A．in | B．at | C．for | D．on |
He has some trouble ______ his classmates, but he has no trouble ______ doing his lessons.
| A．with; with | B．in; in | C．with; in | D．in; with |
I bargained with the shopkeeper for a long time, and finally we agreed________the price.
| A．to | B．with | C．on | D．at |