People in different parts of the world learn to understand one with another.

A:different B:of C:learn D:with

To know what is good and doing what is right are two different things.

A:and B:doing C:are D:different

(There) are (thousand) of (different) types (of) roses.

A:There B:thousand C:different D:of

(There) are (thousand) of (different) types (of) roses.

A:There B:thousand C:different D:of

(There) are (thousand) of (different) types (of) roses.

A:There B:thousand C:different D:of

Costs associated with countries such as( )or a different culture may make international trade more costly than domestic trade．

A:different nature factors B:political difference C:different legal system D:different language