__________ he finishes his chores, he cannot go out to ...

★ Adverb & Compound Sentences

__________ he finishes his chores, he cannot go out to play, __________ he should start by cleaning his bedroom.

A. Once, but

B. Before, or

C. Until, so

D. Since, so

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__________ the teacher explains the concept well, __________ the students take notes, they will understand the topic more clearly.

A. While, or

B. Once, but

C. If, and

D. Since, so