[填空题]
Directions: Insert the correct words or phrases in the appropriate spaces in the passage below.

investigate, quantity, discount, negligence, replements, discrepancy, packing list, unsaleable, inferior, penalty clause, up to standard

Complaints are often received by companies who ship consignments overseas. These complaints are sometimes about the {{U}} (26) {{/U}} of goods received. Perhaps not enough goods were sent, perhaps too many. And sometimes it is a complaint that the wrong goods were sent.
Often there are complaints about {{U}} (27) {{/U}} packing, which can cause damage to the goods. Sometimes the complaint is about inferior quality. Buyers in this case often complain that the goods are not {{U}} (28) {{/U}} There may be a {{U}} (29) {{/U}} between the description of the goods in the brochure and the goods which actually arrived.
A complaint may be about a delay in shipment, although companies often have a