Обращаюсь к умным людям. Помогите мне пожалуйста с английским языком... Кто чем сможет. (Предлоги)

Не знаю, насколько я умный человек, но попытаюсь помочь.
Правда я очень сомневаюсь в правильности. Особенно в первом предложении.

1. Payment was to be made by cash within 30 days upon(?) receipt of all shipping
documents.
2. Much attention must be paid to seaproof packing, especially when goods are
shipped from African countries.
3. For(?) export packing, machines are often wrapped up with polythene and then put
in special crates.
4. The customers sent an enquiry about women’s shoes for autumn wear, but were
informed that the company could not supply them with the shoes as they were not
in stock at that moment.
5. Two inspectors arrived in London to be present at the tests of the new model
of compressors.
6. The Seller’s offer was valid for a period of 90 days from the date of their
quotation.
7. Mashexport promised to submit to the British company any samples of
cameras they will require.
8. In the past this company supplied us with their chemicals. Now they want us to
advise them our current requirements.
9. In accordance with Mr Ranson’s letter his company is going to increase their
prices by 6% in May.