custom
| A．measure | B．upstairs | C．respect | D．sugar |
It is in the city ________ you’re going to pay a visit to _______ this kind of beer is produced.
| A．/; that | B．where; that | C．/; where | D．that; which |
It was ________ she got home ________ she found her diamond necklace missing.
| A．not until; that | B．not until; when | C．until; when | D．until; that |
While watching television, _______________________.
| A．the doorbell rang | B．we heard the doorbell ring |
| C．there was someone knocking at the door | D．we heard the doorbell rung |
_______ by greater demand of vegetables, farmers have built more green houses.
| A．Driven | B．Being driven | C．To drive | D．Having driven |
________ they become dirty, the lakes are not able to clean themselves
| A．Once | B．Since | C．As | D．Because |