hehe, you should pay more attention to grammer problems!
One of my clients came to my factory to visit at this afternoon that they came from Europe and there was an office in Shenzhen.
came to visit your factory, much better.
you should say this afternoon not at ~.
that they came~, why? you should use another sentence: (They said) they came from ~~,and they have a brach (or office) in Shenzhen.
and spoke it in English, ~~, speak English, is ok, and speak is a transitive verb(及物动词), in is not suitable in the structure. You talked with them in English...
foreigner is a countable noun, in the context, you should use foreigners not foreigner, what's more, you'd better call them guests not foreigners, at least they are your clients.
one of your mates took a leave to take part in her examinations, and I have to do her job when she was absent.
not maybe, you may say: because I am not~..
document is a countable word too. your may use documents.But "files" is a more suitable one. ..,
she is go all out for it, and closed her mobile phone.
I cannot get touch with her.
one of my clients sent a document of files to quote for??/
but(not and) I didn't know how to quote (报价的对象)
I am very worried about it and I thought I couldnot make it.
the guest wanted to take the reply immediately, and was annoied at ~~.
finished the job, and gave it be my manager to confirm.