Fill in the blanks choosing the correct form of adjectives .
Iron is the ------- of all metals
Amost usefull
Bmore usefull
Cuseless
Duseful
Amost usefull
Bmore usefull
Cuseless
Duseful
Related Questions:
Fill in the blanks with the correct degree of comparison.
The exam is ______ ( easy) than the last one .