All birds can fly. Ask, before you take the test, if you are penalized for guessing. The teacher subtracts the number wrong from the number right. It's easy to get mixed up. Statements with never, always, no one, are likely to be false.
Moderate statements are often true.
Extreme statements are almost always false. If none of them makes a better statement than the modifier already in the sentence, the statement is true. That is, it is difficult to make any statement which is true of all or no items to which it refers. In this type of test the statement is made with one important word left out. You must recall and supply that word.