7. Напишите существительные, выделенные жирным шрифтом, в единственном числе, сделав, где необходимо, соответствующие изменения в предложении: 1. Women and children came to the shore. 2. The keys to the boxes were lost. 3. The wolves have been shot. 4. The mice were caught. 5. These factories produce furniture. 6. Copies of these letters will be sent to Leningrad. 7. The cargoes will be discharged to-morrow.