.It's a pity,many of the children in the world are still suffering from hunger

->I wish no child in the world are still suffered from hunger

2.People in the world have conflicts and don't live in peace

->I wish that people in the world didn't have conflict and lived in peace

3.She never smiles at me

-> I wish that she smiled at me

4.Why don't you give up smoking?

-> I wish that you gave up smoking

5.I would love to travel abroad

->If only that I traveled abroad

6.She is always leaving her books at home

->I wish that she didn't leave her books at home

7.His mother is sorry he can never get good marks

>His mother wishes that he could get good marks

=>

1. I wish no child in the world was suffering from hunger. 

2. I wish people in the world didn't have conflict and lived in peace. 

3. I wish she smiled at me. 

4. I wish you gave up smoking. 

5. If only I could travel abroad. 

6. I wish she weren't always living her books at home. 

7. His mother wishes he could get good marks.