A. be B. being C. is D. are
A. existed B. existing C. to exist D. exists
A. was B. were C. be D. being
A. Have… been B. Will…be C. Had…been D. Would… be
A. to write B. write C. writing D. written
A. will be B. would be C. had been D. was
A. to lose B. lost C. losing D. lose
A. appear to be B. appears to be C. appear being D. appears being
A. to be B. being C. be D. may be