Good manners may be varied（） cultural backgrounds.

Junior Achievement has（） different stages in its development.

Accounting mistakes cannot be avoided.

We usually keep a large supply （）stock.

- What can I do for you， Madam？- 500yuan in cash to my son in Beijing University.（） 

The manager asked me （）I could finish my work before the weekend.

The payment is made by an irrevocable（） letter of credit in our favor.

（）a vacation is always a good way to get relaxation and refreshment.

It is very important to understand buyers’ behavior.

一 Hello， this is Steven Smith. Nice to hear your voice again.Hi， Mr. Smith. the coverage of your freight forwarding business？ -（）.