Measures have been taken to prevent accidents, but much ______ for more improvement.
| A．remains to be done | B．is remained to do |
| C．remains to do | D．is remained to be done |
— Are these seats available?
— Sorry, sir. The seats _____.
| A．have reserved | B．are reserved | C．reserved | D．are reserving |
It is difficult for children to change their eating habit later in life. _____，parents should encourage healthy eating from an early age.
| A．Otherwise | B．Therefore | C．Besides | D．However |
You have no chance of getting the position. I’m afraid you _____ your time if you apply for it.
| A．waste | B．have wasted | C．have been wasting | D．will be wasting |
With economy developing at great speed, our city has _____ quite a few changes in recent years.
| A．witnessed | B．accumulated | C．arisen | D．introduced |
Currently，many American women are still faced with the _____ of choosing between work and family commitments.
| A．desperation | B．confusion | C．dilemma | D．concern |