1.Tom,you shouldn't(A) have run across(B) the street without looking around,you might(C) be knocked(D) down by a car.
　　2.You went to(A) the wrong shop.You ought to go(B) to the shop next to the cinema,but you went to(C) the shop by(D) the post office.
　　3.If you had(A) others(B) do(D) you homework ,you might as well having(D) them eat your lunch.
　　4.He asked(A) me a(B) second question before I couldn't(C) answer the(D) first one.
　　5.We had(A) better to review this chapter(B) carefully because we will(C) have(D) some questions on it in our test tomorrow.
　　答案：1. D (改为：have been knocked ）
　　2. B (改为：have gone)
　　3．D (改为：have)
　　4. C (改为：could)
　　5. B (改为：review this chapter)

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