"To keep..." = "To continue..." You use a gerund after "keep", so you'd say "to keep practising/practicing". Both "Why do I get the feeling I need..." and "Why do I have the feeling I need..." are correct, but "Why have I the feeling I need..." is also correct in poetic, old-fashioned or dialectal speech. Both "What is the most delicious food?" and "What food is the most delicious?" are correct. They both mean the same thing. It's the same with "The moon has already risen" and "The moon has risen already". "Have you spent it all" and "Have you spent everything" are very similar. "It all" implies there's a known amount of money "it", but this difference is very subtle. "They spent much" is much more formal than "They spent a lot". Neither "at that day" nor "in that day" are correct. You'd just say "that day" (or possibly "on that day"). You'd say either "at the office" or "in the office". The former is more natural, but since offices are generally indoors it's not incorrect to use the latter. By the way, the title of your question should be "A couple of questions about English". You'd also say "This was the first question". "True" isn't the right word in this context. You'd say "right" or "correct" (ie. not wrong). If a statement's "true", it describes a real situation. If you asked if "It's Thursday" was correct, I'd say "Yes, it's grammatically correct". If you asked if the same sentence was true, I'd say "No, it's actually Tuesday". "Where" asks for location. You'd say "Which sentence is correct?".

Why do I get the feeling I need... What is the most delicious food? The moon has already risen, and the moon has risen already are the same sentence, they are both used in the English language. The difference is personal preference. Have you spent it all, and have you spent everything are also both used, and depend on personal preference. They spent a lot in that day, would usually be said 'they spent a lot that day' We always met at office would usually be said 'we always meet at the office' for present tense Or 'we alway met at the office' for past tense 'We will meet at the office' for future. Remember: when stating a place, we use 'the' before the place. The office, the shop, the amusement park. :) Hope this helps!