Chia đúng dạng từ trong ngoặc

1. I think you should .......garbage bins around the schoolyard ( put)
2. He..........that letter yesterday. (write)
3. Ba..........on the phone for two hours. (talk)
4. The Earth..........around the Sun. (circle)
5. She.......here in 10 minutes. (be)
6. I am looking forward to.....from my pen pal. (hear)