You may write the letter ... ink. 2) Peter, you can go there ... bus

1)
1.you may write the letter ............ ink
2.Peter, you can go there .......... bus
3.Look! We are flying ............. one of the highest muontains in the word.
2) 
1.The Earth is the name of the .......................... we live on.
a.planet           b.world           c.place            d.region
2.He'll come ............ to pick you ..................
a.on/ in        b.over/ on         c.out/ on        d.over/ up
3.he worked ........... deaf- mutes ........... Boston University.
a.with/ at             b.as/ at         c.with/ in          d.as/ in
4.The children are old enough to look after ................
a.ourselves         b.themselves        c.themself          d.them
5.He ............... move to another house last week.
a.ought to           b.must          c.had to         d.should