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The ancient Aztec of Mexico had no technology for making tools from metal. ________, they had sharp knives and spears made from a stone called obsidian.

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He promised to be on time; ____________, he arrived late to the meeting.

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The weather was hot and sunny. ____________, we decided to go to the beach.

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She bought the book ______________ she had heard it was good.

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Two of the factories in our small town have closed. ______________, unemployment is high.

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It is still a good idea to know how to type. ________ the many technological advances in typewriters and word processors, a skilled operator remains indispensable.

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The main problem ______ the climbers was lack of sleep.

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____________ we got lost driving into the city, we were late for the meeting.