I think physics is ________ and difficult________.

__ the past, leaving the sadness behind, _____ you’ll see the doorof a new bright world open before you.

In the end,he decided to send the sick child to hospital.

Though he didn’t agree with us at first，we soon ________ him to our way of thinking.[ ]

　-　Chinese　tennis　player　Li　Na　won　a　championship　again!-　Yeah,　I　watched　the　game　and　my　spirits　_____　at　the　news.