1. Unless Peter is invented, Mary won't come to the party.
2. a/ I'll give you another hour ...
A. making your mind up
B. making up your mind
C. make up your mind
D. to make up your mind
b/ They are rich enough to own ....
A. not a helicopter only, but a yacht as well
B. not only a helicopter, but a yacht as well
C. only a helicopter, but a yacht as wel
D. as well as a helicopter, not only a yacht