A. had been;would have prevented B. had been;would prevent C. were;would prevent D. were;would have prevented
A. would be B. should be C. were to be D. must be
A. would rise B. would risen C. would have risen D. had risen
A. is living there B. was living there C. has lived there D. had lived there
A. saw B. did see C. had seen D. were to see
A. wouldn't be burning B. would not burn C. would not have been burned D. wouldn't be burnt
A. would B. will be C. would have been D. would be
A. don't do B. didn't do C. hadn't done D. won't do
A. returns B. should have returned C. were to return D. have returned
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