_______________ begin their existence as ice crystals over most of ...

[ Noun Clauses ]

_______________ begin their existence as ice crystals over most of the earth seems likely.

A. Raindrops

B. If raindrops

C. What if raindrops

D. That raindrops

Select your answer:

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What _______ your brothers do for living?

A. do

B. does

C. is

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Choose the appropriate perfect verb tense: The train _____________ and is now filling up with new passengers.

A. has arrived

B. had arrived

C. will have arrived