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Конечно, помогу тебе с этим упражнением. Нужно заполнить пропуски в тексте предлогами. Давай сделаем это вместе:

1. The agent is entitled to commission ___ all sales ___ the area.
2. The contract is valid ___ the end ___ the period, or the termination ___ the agreement ___ either party.
3. The agent's commission is set ___ his commission statement.
4. Thank you ___ the letter ___ June 7 ___ which you offered us a sole agency ___ your products in Poland.
5. We ___ turn will settle ___ you deducting our commission.
6. All the items you are interested ___ can be supplied ___ stock.
7. In your fax ___ May 1 you offered to help us ___ advertising.
8. If agents buy ___ their own account they will make a profit the difference ___ the ex-works price and the resale price.
9. The agent may work ___ a commission, i.e., buying the goods ___ consignment.
10. Forwarding agents ensure that the goods are cleared ___ customs and are sent ___ the importer.

Теперь давай разберёмся с каждым пунктом и подберём подходящие предлоги:

1. "to" уже вставлен за нас, нужно добавить "for" - for all sales, "in" - in the area
2. "until" - until the end, "of" - of the period, "or" - or the termination, "by" - by either party
3. "in" - in his commission statement
4. "for" - for the letter, "dated" - dated June 7, "which" не является предлогом, здесь оно выполняет роль относительного местоимения, "as" - as a sole agency, "for" - for your products
5. "in" - in turn, "with" - with you
6. "in" - in which, "from" - from stock
7. "dated" - dated May 1 или "on" - on May 1, "with" - with advertising
8. "on" - on their own account, "between" - between the ex-works price and the resale price
9. "on" - on a commission, "on" - on consignment
10. "through" - through customs, "to" - to the importer

Надеюсь, это поможет тебе правильно выполнить задание. Удачи!