during（）

Valve overlap is the period during which （）. During the suction stroke, the piston is moving （）. Please _________ during the party time. During the third step of adaptation, newcomers ______________. During the transfer process,（）are needed. What will be served during the coffee break? Children get _______ during the holidays. The fruit should be well ______ during summer the Gate of () was safe during the furious battle? Please ??????????your phone during meeting! (? ?) Is this the restaurant_during the summer vacation（） It is not necessary to stick to the agenda during the meeting（） Australians rest for （） during Christmas. Which is NOT the tradition in Australia during Christmas? The baby always wakes up during _____. During repair,lubrication lines and orifices must be （）. We may infer that during the summer holidays ______. The most important birth force during delivery is During the holiday, ____ people went to travel. There are ______ flowers in the square during the National Day.