Beforetheflighttakesoff,allpassengers(ask)_________tofastentheirseabelts.
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The price of gas has greatly (increase) __________ in recent years.
Our company's most (value) ___________ resources are its employees
The salesgirl has made a detailed introduction to the (function) __________ of online services.
These programs are (design) _________ to provide best services for the poor people.