-- Did you visit your grandparents yesterday?
--Yes, and when I got there, they _____ in the fields .
| A．worked | B．have worked | C．were working | D．had worked |
It is not who is right but what is right ______ is of importance.
| A．which | B．it | C．that | D．this |
That was a terrible night . The rain was pouring down, _________ thunder and lightning.
| A．being accompanied by | B．accompanied by | C．accompanying | D．accompanies |
The bus hit against a tree in the fog and __________to the deep valley, with ten passengers killed and twenty wounded.
| A．down did it roll | B．down rolled it | C．down it rolled | D．it down rolled |
Understanding the cultural habits of another nation, especially ____________ containing as many different subcultures as the United States, is very difficult.
| A．one | B．that | C．some | D．the one |
As we all know, apples are sold by ____ weight, and socks are sold by _______dozen.
| A．the; a | B．/; a | C．/; the | D．the; the |