As you can see, we need the equipments, ___________ are necessary to make the project move on.
Have you found out the exact reason why the dinosaur _________ many years ago?
With the development of Chinese economy, many unexpected problems have ________; for example, the prices of our daily goods and housing are ________ sharply.
The field research will take Luffy and Steven about two weeks; it will be a long time _______ we _______ again.
The person who is _______ of the factory _______ ill since last week.
Diaoyu Islands are made up of a group of islands, ________ China since ancient times.