1)Vicky has her own style, she wore a man's tuxedo with a red bow tie to her cousin's wedding. -Reducing the wordiness by taking out "of dressing" is effective. You describe what aspect of her style you are talking about in the rest of the sentence. 2)We heard a crash in the kitchen but the embarrassed hostess hasn't explained it. -Your tenses must match. 3)The key of the magazine's success was that it employed new and exciting writers. 4)However, our boss expects us to work four hours without a break. He wanders off to a vending machine for at least an hour. -The workers are counted on to work 4 hours without stopping but their boss is distracted at a vending machine for at least 1 hour, not working. 5)The silent letter in some words changes the way the word sounds when it is pronounced. -You pretend the silent letter is not there when you read it but must remember to put it when spelling the word. An example is how the k in knife is not pronounced.