在编写程序代码前，应该先做设计。Before we code a program, we should design it.
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We should check the bill again before we pay for it.
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We<br/>are going to design a program to ____ the identity code of the<br/>devices. A: validate B: certify C: illustrate D: demonstrate
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Before launching any sales program, you should design an attractive promotion plan。（)
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This house is really expensive. We are looking for an expert to _____ it before we decided to buy it.
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We had our recognition _________ program before the movie started.