试翻译下列句子。 (1) Party A shall pay Party B a monthly salary of US $500 (SAY FIVE HUNDRED US DOLLARS ONLY). (2) This credit expires till January 1 (inclusive) for negotiation in Beijing. (3) This Contract is made by and between the Buyer and the Seller, whereby the Buyer agrees to buy and the Seller agrees to sell the under-mentioned commodity subject to the terms and conditions stipulated below. (4) This Contract shall come into force from the date of execution hereof by the Buyer and the Builder. (5) The undersigned hereby agrees that the new products whereto this trade name is more appropriate are made in China.