选词填空。 Where, How, on foot, traffic rules, Wait 1. ______________ do you go to school? 2. I go to the zoo ______________. 3. ______________ is your home? 4. Remember the ______________. 5. ______________ at a yellow light.
【单选题】Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure ______.