I'm with mmijaved. None of those answers are correct.

Not really a grammar question, but a good one nonetheless. Both "study" and "learn" are about knowledge, but one is cause and the other effect: to study is to pursue, and to learn is to acquire.

You don't even know me. Of course, you'd want to keep secrets from me. Anyway, if I can read you like a book, I know everything you're thinking.

The "about" is implied. You don't need to say it, though either is correct.

Other way around: It means you cannot keep any secrets from me.

Since "before now" and "by now" mean exactly what they say, logically, "before now" can never be used with the present tense, since it always describes past actions, but "by now" can, though usually in highly stylized prose ("By now, I am

"Apple is tasty" refers to apple-flavored things, whereas "the apple is tasty" refers to an individual apple. In general, a singular noun without an article refers to a class or type rather than to specific objects. For example, if someone asked

How's this: "If it were up to me, everyone would ride bicycles." "If I were you, I'd skip the underwear."

You're right that the subject "none" calls for a singular verb, but the "if" makes the clause conditional, so "were" is correct. Similar examples: "If it were up to me..." and "If I were you..." Sweeney Todd is a musical about a murderous barber.

Not really a grammar question, is it? But here's what I think: "Make", "produce", and "manufacture" are synonyms and so can be used interchangeably. Here are the subtle differences. "Make" is the only one of the three that might suggest doing