In which of the sentences below is the shift in verb tense acceptable? [check all that apply]
a. i was in the studio when the phone rings.
b. though the weather had been rough, we made ti home safely.
c. by the time i returned home three hours had passed.
d. i had called the police then alerted the neighbors.
e. they were strolling downtown when they had heard the crash.

The rich natural resources made the sacramento valley a "garden of eden." permanent villages were established about 8,000 years ago.which choice combines these two sentences from paragraph two to achieve a coherent flow of ideas? a) the rich natural resources made the sacramento valley a "garden of eden" and permanent villages were established about 8,000 years ago. b) permanent villages were established about 8,000 years ago and the rich natural resources made the sacramento valley a "garden of eden." c) the rich natural resources made the sacramento valley a "garden of eden; " and so the permanent villages were established about 8,000 years ago. d) because of the rich natural resources which made the sacramento valley a ‘garden of eden,’ native americans established permanent villages there 8,000 years ago.