1 What medicine is the most efficient to cure the disease? <- Missing question mark. 2 Show me where is the Russia on the map. <- "Show me where Russia is on the map." Two mistakes: it's "Russia" not "the Russia". Also the verb "is" has to be after the subject, because it's not a question ("Where is Russia?", but "Show me where Russia is." 3 How many apples are there on the table altogether ? <- Correct.

You are very close. Here is what would sound even better: 1. Which medicine is most effective to cure the disease? (Efficient and effective have slightly different meanings.) 2 Show me where Russia is on the map. (You don't need to use "the" with names of countries. Also, put the verb "is" after the object you are looking for.) 3 How many apples are there on the table altogether? (This sentence is fine. It has a slightly deeper meaning than "How many apples are on the table?") I hope this helps!

You have to many unnecessary words in your examples. I would word them slightly differently: 1. What is the most effective medicine to cure the disease? 2. Can you show me Russia on the map, please? 3. How many apples are on the table?

first one , you are correct with " Question mark " second one , it is supposed to be : show me where the Russia is on the map final one is correct

Thank you