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C: Have you D: Do you 正确答案:

(单选题) 16: My sister is used to ___ with all the window’s open. A: sleep B: sleeping C: have slept D: the sleeping 正确答案:

(单选题) 17: It’s no use ___ your chickens before they are hatched. A: count B: to count C: counting D: of counting 正确答案:

(单选题) 18: Visitors can visit the culture relics but cause ____ them。 A: no damage to B: no destroy to C: damage to D: destroy to 正确答案:

(单选题) 19: The World Trade Center is higher than （ ） I have ever seen during my visit.

A: any buildings

B: any other buildings C: all the buildings 正确答案:

(单选题) 20: My sister is used to ___ with all the window’s open. A: sleep B: sleeping C: have slept D: the sleeping 正确答案: