I suggest that that we should take part in more such activities in future _______we did yesterday.
| A．which | B．as | C．that | D．than |
In 89 BC, Pompeii became a rich and busy city and near the city ____ a volcano.
| A．be | B．being | C．had | D．Was |
While the soldier’s idea was interesting, the system was too difficult to be ____.
| A．of practical use | B．practical usefully |
| C．practice use | D．practice used |
In old days, books for blind people used paper ____ against metal wire to form letters.
| A．to press | B．pressing | C．pressed | D．which pressed |
One winter day ____, he saw the tracks of animals in the snow and observed that the appearance of each one was different.
| A．while he hunting | B．while hunting |
| C．while he hunt | D．while hunted |
People from the West like to use these words in cases ____ some people in Asia may not think it necessary.
| A．which | B．that | C．what | D．Where |