VI. Find and correct the mistakes in these sentences.
23. Paul is very “tired” (A) “because” (B) he didn’t “slept” (C) ” well ” (D) last night.
24. “Have” (A) you ever “be” (B) “to” (C) “Paris” (D)?
25. “If” (A) we “polluted” (B) the air, we will “have” (C) “breathing” (D) “problems”.