____ at a college or university in the USA, Chinese and other international students must demonstrate a strong ability in spoken and written English.
| A．Having been accepted | B．To be accepted | C．Being accepted | D．Accepted |
we are laid off, all of us will have to be retrained and improve ourselves.
| A．Unless | B．So that | C．Until | D．In case |
-----Is this the first time youQuanzhou?
-----No. But the first time Ihere, the city wasn’t so beautiful.
| A．visited; came | B．visited; have come |
| C．have visited; have come | D．have visited; came |
After months of voyage, Columbus arrived in what laterto be a new continent.
| A．had been proved | B．was proved | C．had proved | D．proved |
we can’t remove our troubles in life forever, we can leave them behind when we are on vocation.
| A．When | B．While | C．Unless | D．Until |
Many migrant workers, city life, wouldn’t like to move back to the countryside.
| A．accustomed to | B．being accustomed to |
| C．have accustomed to | D．have been accustomed to |