Помогите плиз! Нужно вставить a, the или ничего lets arrange… . party at… weekend. its… lovely day, isn't it?…

Помогите плиз! Нужно вставить a, the или ничего lets arrange… . party at… weekend. its… lovely day, isn't it? he is in… fifth form, isn't he? … Serovs visited… London in… March… . Linda is going to visit… Finland… next month. would you like to stay with… Browns? They are going to have… picnic. have… good time!