1)books - M, clothers - A, food - M, school bag -A,second-hand goods - M.
2) 1.On the first Sunday of the month.
2. The second-goods area
3. He bought old paperweight. He uses it to stop papers from blowing away.
4. The musicians
5.She buys clothers(latest fashions frow Europe)
6. Because they are so far away.