__________ he took part in the competition, he won a second prize.
| A．The first time | B．For the first time | C．At a time | D．At one time |
He had been _______ good terms with Tom, but all of ____ sudden they lost in touch with each other.
| A．on ; a | B．in ; / | C．on ; the | D．in ; a |
Imagine what today’s life would be like if Alexander Bell _____ the telephone more than 130 years ago!
| A．didn’t invent | B．wouldn’t invent |
| C．hadn’t invented | D．wouldn’t have invented |
Their sudden attack made us more ________ of the danger around us.
| A．familiar | B．particular | C．aware | D．doubtful |
Miss Li ___ as a secretary for five years in the company, and now she is general manager of it.
| A．has served | B．had served | C．served | D．serves |
What a(n) _______ it is that the new couple were born in the same year and on the same day.
| A．acquaintance | B．consequence | C．circumstance | D．coincidence |