English Grammar in Use Fifth Edition

UNIT 66
66.1
3  I’m afraid of losing it.
4  I was afraid to tell her.
5  We were afraid of missing our train.
6  We were afraid to look.
7  I was afraid of dropping it.
8  Don’t be afraid to ask.
9  I was afraid of running out of petrol.
66.2
2  interested in starting
3  interested to know / interested to hear 
4  interested in studying 
5  interested to hear / interested to 
know (interested in hearing/knowing 
is also possible here
)
6  interested in looking
66.3
2  sorry to hear
3  sorry for saying / sorry I said
4  sorry to see
5  sorry for making / sorry I made
66.4
1  b  to leave
 
c  from leaving
2  a  to solve
b  to solve
 
c  in solving
3  a  of going / about going
b  to go (
or
 on going)
c  to go
d  to going
4  a  to buy
b  on buying 
c  to buy
d  of buying