__________ the class, the students left the classroom one by one.
A. At the end of B. In the end C. By the end
I don’t like doing the cleaning, because it is ________.
| A．interesting | B．fun | C．boring | D．relaxing |
The boy spent 10 dollars ________ the model plane.
| A．on | B．with | C．at | D．for |
America is a ________ country.
A.develop B.development C.developing D,developed
We should keep our classroom _______.
| A．clean | B．cleaning | C．to clean | D．cleans |
Would you please ________ my dog when I go out for travelling?
| A．take out | B．take care of | C．take part in | D．take away from |