Your variant in the 1st is correct, there must be a mistakes in the book 2. They choose "восьмого" because this word is answering the question "когда", so you need р.п.: дарят когда? — восьмого марта 3. Когда is using when you need to know the exact time or period of time when smth happened or will happen. Когда = when Сколько времени = how long Который час is using as a question What time is it? 4. There is no question%) 5. Because it is asked about the result, not the action itself. It would be translated into Present Perfect: He has already written his thesis, hasn't he?

4. In English it would be "where I can buy..."... Actually in some contexts "где можно покупать билеты?" would sound natural. But USUALLY this question is asked with "купить". Perfective means doing it once and it implies SUCCESS. This gives a hint that you WANT to have those tickets. If you ask: "Где здесь можно поесть/поужинать?" I will think that you're asking about restaurants nearby. That you're asking me where you can GET a dinner. You didn't say it directly but perfective suggests an idea of fulfillment of some wish. 5. If you're asking if he has _finished_ writing it, then "написал" means exactly this. If you're asking somethign else, you can use "писал":)

1. you're right. "Он мечтает научить..." 2, 3. Что это за страна? (Какая это страна?) - Египет. Где ты живёшь? - В Египте. Сколько сейчас времени? - Полвосьмого. Во сколько ты встаешь? - В полвосьмого. Какой сейчас день недели? - Воскресенье. Когда у тебя выходной? - В воскресенье. "Где", "когда", "в Египте", "в воскресенье", "в полвосьмого" work like adverbs. I think it is clear with Egypt: "in Egypt" is not the same as "Egypt". Similarly "in 7:30" is like a place where (when) the action happens. 2. Russian has a variety of ways to form such adverbials:/ "В пятницу" (в + acc) "в январе" (в+prep), "прошлой весной" (instr) (or в прошлую вecну). For dates we usually use genitive. As for "why", I wonder myself:) 3 написала, когда... написала, во сколько... написала, в котором часу..., написала, какого числа... Compare: "сколько сейчас времени?" "7 часов". (no "in") ---- "_ВО_ сколько ты встаёшь? "В 7". ("in") "Какая это страна?" "Египет". (no "in") "_В_ какой стране ты живёшь?" "В Египте". ("in")

شكرا :)

امتحانات سعيدة :)