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
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