According to statistics, Chinese people between the ages of 18 and 70 read 6.7 books___ last year, including paper books and e-books.
| A．on purpose | B．in return |
| C．on average | D．in common |
Professor Li and his wife are now at work on a novelnext year.
| A．to publish | B．being published |
| C．published | D．to be published |
The couple walked together as far as the second crossing of the streetthey waved goodbye to each other.
| A．when | B．which |
| C．why | D．where |
I had been puzzled over the problem for over an hour without any result, all at once a solution flashed across my mind.
| A．while | B．when |
| C．then | D．as |
—So hardin the past few years that he has made great progress in English.
—I can see that, only a few mistakesin this exam.
| A．has he worked; did he make | B．he has worked; he made |
| C．he has worked; has he made | D．has he worked; he made |
Betty shows great interest in this poem now, but she thought it boringshe read it.
| A．at the first time | B．the first time |
| C．for the first time | D．at first |