46. Which of the following sentences   misuses   coordination? (A) The automobile came into common use in the 1920s, and they are now indispensable for public transportation. (B) Modern automobiles are very complex, and they are sometimes hard to repair. (C) The automobile replaced the horse and buggy, and made possible the growth of the suburb. (D) The automobile was common in the 1940s, and they sometimes make costly mistakes.

48. In which of the following sentences is the punctuation correct? (A) If things go wrong, it must be a personal, human error, the result of fingering, tampering, a button getting stuck, someone hitting the wrong key. (B) If things go wrong it must be a personal, human error, the result of fingering, tampering, a button getting stuck, someone hitting the wrong key. (C) If things go wrong: it must be a personal, human error, the result of fingering, tampering, a button getting stuck, someone hitting the wrong key. (D) If things go wrong, it must be a personal, human error, the result of fingering, tampering, a button getting stuck someone hitting the wrong key.

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