I. Find the mistake in the four underlined parts A, B, C or D of each sentence. 1. If someone came into the store, smile and say, “May I help you?” A B C D 2. If you try these cosmetics, you look five years younger. A B C D 3. If you do not understand what were written in the book, you could ask Mr. Pike. A B C D 4. I will come to meet Mr. Pike and tell him about your problems if you didn’t solve them A B C D yourself. 5. Sam will not graduate unless he doesn’t pass all the tests. A B C D