Will you change your exam options? If not, just recite abcd directly. The big problem is mainly to understand and then do it yourself. If you forget the steps in the exam, but remember the answer, just write it casually in the process of doing the problem (you can write a few formulas and then say that you can get it directly according to the formula), and finally write the answer. If you don't know anything about filling in the blanks, just recite them directly, but the main thing is not to mix them up. You can use "association" method.