Eye doctors recommend that a child’s first eye exam ____at the age of six months old.
After three hours'climbing,they reached ________ they thought was the place they'd been dreaming of.
John invited about 40 people to his wedding,most of ________ are family members.
When I arrived,Bryan took me to see the house________I would be staying.
We have launched another manmade satellite,________is announced in today's newspaper.
Nowadays people are more concerned about the environment________they live.