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2. To his (disappoint) _________, he found that none of his sons was interested in running the family business.

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3. (Fortunate) _____________, they obtained a small business loan from a local bank.

4. John is our hardware engineer and he'll have your computer (fix) ___________.

5. We (excite) ______________ about Industry 4.0 because it represents the next great step forward for businesses.

多个单片机系统协调工作，要求同步性要求较高时，采用____时钟方式。