Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 33 to 37. 

        It is terrible but we are not (33) ______ against crime. The first step towards preventing crime is understanding its nature. Most crime is against property, not people, and most crime is not carried out by professionals; nor is it carefully planned. Property crimes (34) ______ on the easy opportunity. They are often committed by adolescents and young men, the majority of whom stop offending as they grow older. (35) ______ ages for offending are 15 to 18. Also, and not surprisingly, the risk of being a victim of crime (36) ______ greatly depending on where you live. This reliance by criminals on the easy opportunity is the key to much crime prevention. Motor cars, for example, are a sitting target for the criminal. Surveys have shown that approximately one in five drivers do not always bother to secure their cars by locking all the doors and shutting all the windows, and in 30 percent of domestic burglaries, the burglar simply walks in without having to use (37) ______. If opportunities like these did not exist, criminals would have a much harder time. The chances are that many crimes would not be committed, which would release more police time for tackling serious crimes.

Điền vào số (35)

A. peak      

B. major      

C. maximum        

D. top

Tiến hành các thí nghiệm sau:

    (a) Nhúng lá nhôm vào dung dịch natri hiđroxit.            

    (b) Cho mẫu đá vôi vào dung dịch axit clohiđric.

    (c) Cho natri vào dung dịch đồng(II) sunfat.                  

    (d) Đun nóng dung dịch canxi hiđrocacbonat.

Số thí nghiệm xảy ra phản ứng hóa học có tạo ra chất khí là

A. 2.

B. 4.

C. 3.

D. 1.