In communication, a smile is usually _____ strong sign of a friendly and ____ open attitude.
| A．the; / | B．a ; an | C．a ; / | D．the; an |
The lead singer was ill and couldn’t sing that night, and her _______ didn’t perform well, which made the audience disappointed.
| A．attitude | B．substitute | C．institute | D．altitude |
There are solid reasons for China to claim ownership of the Diaoyu Islands, which lie about 200 miles the eastern coast of our country.
| A．to | B．on | C．off | D．of |
My visit to your school is really an unforgettable experience, I will always treasure.
| A．that | B．one | C．it | D．what |
—Did you look up the time of the high-speed trains to Shanghai?
—Yes, the early train is to leave at 5:30 a.m.
| A．likely | B．possible | C．due | D．about |
Doctors strongly recommended that my father more exercise regularly instead of sitting still before a computer all day long.
| A．takes | B．take | C．took | D．had taken |