__________ the professor finished the lecture, the students began discussing ...

★ Adverb & Compound Sentences

__________ the professor finished the lecture, the students began discussing the topic, __________ they soon realized that they were still confused.

A. Since, so

B. While, but

C. If, or

D. Once, but

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__________ she often wakes up late, she misses the school bus almost every day, __________ she will have to find an alternate mode of transportation.

A. If, and

B. Until, but

C. Although, or

D. Since, so