let the student play while study有没有病句?

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• let the student play while study有没有病句?
• 七年级下册英语看图填空I’m Jack.I am a student.I am good at all the ____ at school .I help my mother with the ____ after school.But my parents give me little freedom .They think ___ TV is badgor my study.They ____ let me go on the Internet ____ listen to music.They ask me to go to bed before eight o'clock ____ night.I must spend all the time on study.I ____ play with my friends on weekends.I can't do the things I want to do.I feel very sad ___ stressed about it.C
• let the student play while study有没有病句?
• （27分之8）的负3分之1次方+根号负2的平方-（0.5）负2次方除16的0.75次方 等于多少
• 在常温下20L密闭容器中通入a mol H2、b mol O2（a≤4，b≤4，a、b均为正整数），点燃后充分反应恢复至原温度时，容器内气体（水蒸气忽略不计）密度最大值可能是（　　） A.5.6 g•L-1 B.9.6 g•L-