(选择题）Students shouldn't go to movies ___ school night.They should go to bed early ___ night.

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• Peter is a good student at school.But some-times he is not a good boy at home.He often makes a mess in his room.He does't like to help to set the dinner table.He watches TV the whole evening.He reads in bed and he goes to bed very late.Peter's mother writes some home rules for him:Home RulesYou should:1.help to set the dinner table.2.go to bed early.3.keep your room clean.You shouldn't:1.read in bed.2.watch TV till late.3.make a mess in your room.句子：Y
• (选择题）Students shouldn't go to movies ___ school night.They should go to bed early ___ night.
• 1--20 等于多少
• Cu2S + NO3- + H+ ==Cu2+ + S + NO + H2O