__________ the teacher explains the concept well, __________ the students ...

★ Adverb & Compound Sentences

__________ 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

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__________ the wind blows strongly, the temperature drops, __________ people start to wear thicker jackets.

A. When, and

B. As soon as, but

C. Although, and

D. Even though, so