Viết lại câu với từ cho trước

1.Remember to do your homework.( must)

→ You  must............................................................................................................
3.  Learning about recycling is fun.(to)

→It’s………………………………………………………………………………………….

4.  It’s not good to throw old clothes away.( should)

→ You  ………………………………………………………………………………………

5.  Peter knew how to ride a bicycle when he was 6. (could)

→Peter…………………………………………………………………………...............