---- Putting on a happy face not only helps us make friends but also makes us feel better.
---- _______.
| A．I’d love to | B．I’m with you on that |
| C．It’s up to you | D．It’s my pleasure |
Loulan is believed ____ by sandstorms from AD 200 to AD 400.
| A．to be gradually covered over |
| B．to have been gradually covered over |
| C．being gradually covered over |
| D．having been gradually covered over |
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 |