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 |
They tried to find a table for two. But they were all _____.
| A．given away | B．kept away | C．taken up | D．used up |
Over two thirds of the population were believed to have no ______ to the health care in the west rural area in China.
| A．aid | B．basis | C．belief | D．access |
You should look _______ into the matter to get more information about it.
| A．farther | B．far | C．farthest | D．further |
They keys were __________ to our neighbours during our absence.
| A．given out | B．given away | C．given over | D．given up |
–Are you a teacher?
--No, but I ________.
| A．used to | B．was used to | C．used to be | D．used to do |