1. I can buy this house . It is ............. .

inexpensive

expensive

hard

tough

2. He is very sad . He is ............. happy .

in

un

on

out

3. He does not accept . He ............ agree .

dis

de

in

un

4. This is not true . There is ............ understanding .

de

mis

un

of

5. He closed his account . He ........... activated it .

off

de

do

in

6. He studies ............ logy . It is the science of living things .

bio

de

mis

ann