A、We’re going to run out of stock of blue trousers, though we do have black trousers. B、Black cannot be used to replace the mate

You should have listened to me! If we hadn’t made the wrong turn, we’d have been on time. They must have waiting too long to be patient.

The order for 100 pairs of blue trousers is proving difficult to meet for we’re out of stock of that particular shade. We do have black.