The post office is closed ______ Saturday afternoon.
| A．on | B．in | C．of | D．at |
He was badly ill，but he kept on________until 2:00 a.m．
| A．work |
| B．working |
| C．worked |
| D．to work |
My uncle was________control of a small company．
| A．for |
| B．in |
| C．to |
| D．on |
The doctor advised my father to give up________．
A．smoke
B．smoking
C．smokes
（陕西）Don’t worry．We’re old enough to look after________．
| A．myself |
| B．me |
| C．ourselves |
| D．us |
—Not only the young but also the old are interested WeChat（微信）．
—They can communicate more freely．
| A．by |
| B．about |
| C．in |
| D．for |