They _______ a factory, __________ there were rice fields.

[    ]

A. pass; whose back　　 

B. past; at the back of it

C. passed; at the back of which

D. passing; at the back of that

What you said ________ right.

[　　]

This problem can be easily worked out ________.

[　　]

________ must love ________ country .

[　　]

I was about to leave ________ the bell rang.

[　　]

Guangdong ________ the south of Hubei .

[　　]

London, the capital of Great Britain, is ________ the Thames.

[　　]

In Brazil the Negroes have ________ a most important part in the development of the nation.

[　　]

People in the south of China live ________ on rice.

[　　]

Much of England is rather flat, ________ there are hills in the northeast and in the centre of the country.

[　　]