The Olympic Games _____.
| A．is held every four years | B．are held every four years |
| C．are held every the fourth years | D．are held every the forth years |
As citizens of our country, it is our duty and responsibility to _______ the legal rights of our own in the election.
| A．stand up for | B．stand out | C．stand by | D．stand up |
________, he knows a lot of things.
| A．A child as he is | B．Child as he is | C．A child as is he | D．Child as is he |
While watching television,__________.
| A．the doorbell rang | B．the doorbell rings |
| C．we heard the doorbell ring | D．we heard the door bell rings |
. Many experts agree that once these treasures are _______ to the air, great harm will be done to them. So they think it better not to unearth the treasures.
| A．exposed | B．threatened | C．constructed | D．conserved |
We agreed ______her but so far she hasn’t turned up yet.
| A．having met | B．meeting | C．to meet | D．to have met |