—What happened to the postman?
—I don't know. He______ around here for a long time.
| A．hasn'tseen | B．didn'tsee | C．wasn'tseen | D．hasn'tbeenseen |
He had ________me not to play games on the Internet again, but hardly could he get rid of them.
| A．wished | B．promised | C．advised | D．persuaded |
Without proper lessons, you could _________a lot of bad habits when playing the piano.
| A．set up | B．catch up | C．pick up | D．keep up |
The college has developed an on-line system ________students can choose their own professors.
| A．where | B．when | C．that | D．which |
As a doctor , it’s against my ______ to accept gifts from patients.
| A．emotions | B．principles | C．regulations | D．opinions |
In communication, a smile is usually ______ strong sign of a friendly and ______ open attitude.
| A．the, / | B．a, an | C．a, / | D．the, an |