—Look，the paint is starting to come off ________the wall is damp.
—Well，we’d better have the wall repainted some day.
| A．when | B．where | C．if | D．once |
Every possible means _______ to prevent the crash , but the computer doesn’t still work．
| A．is used | B．are used |
| C．has been used | D．have been used |
Have you made up your mind ________ abroad? I advise you to consider it carefully.
| A．study | B．to study | C．studying | D．studied |
________ get a complete picture, more information is needed.
| A．So as to | B．So as not to | C．In order not to | D．In order to |
The USA is a large country in ________ many different dialects are spoken.
| A．that | B．which | C．where | D．it |
Look at this! It’s broken now! You ________ have been careful!
| A．could | B．must | C．would | D．should |