Only when they were told of the importance of time ________ wasting time is like wasting part of their lives．
| A．those boys realized | B．those boys had realized |
| C．had those boys realized | D．did those boys realize |
In fact, _______ one cause that leads to the problem.
| A．cattle is | B．cattle are |
| C．cattles are | D．the cattles are |
The students _______ busily when Miss Brown went to get a book she _______ in the office.
| A．had written, left | B．were writing, has left |
| C．had written, had left | D．were writing, had left |
Her father works as a ______ in a hotel and her mother a ______ in a private company.
| A．cooker, typewriter | B．cook, typist |
| C．cooker, typist | D．cook, typewriter |
. I think you must be mistaken about seeing him at the theatre； I’m sure he _____ abroad all week.
| A．is | B．was |
| C．has been | D．had been |
I found her sitting in the corner, reading _____ newspaper, with _____ in her eyes.
| A．a, tear | B．a piece of, tears |
| C．a, tears | D．a piece of, tear |