Chất nào sau đây vừa tác dụng được với vừa tác dụng với  C H 3 N H 2 ?

A. NaCl

B. HCl

D. NaOH

Mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions.

If _________, he promises that he will do his best to promote public welfare.

A. electing

B. elected

C. being elected

D. elect

X là peptit mạch hở (được tạo bởi Gly, Ala và Val), Y là chất béo rắn. Hỗn hợp E chứa X, Y với tỷ lệ mol tương ứng là 2:1. Đun nóng m gam E trong 110 ml dung dịch NaOH 1M vừa đủ thu được bốn muối Z và glixerol. Đốt cháy hoàn toàn E cần dùng vừa đủ 1,115 mol O₂. Sản phẩm cháy thu được có chứa 0,04 mol N₂. Giá trị của m là?

A. 11,58

B. 14,94

C. 18,43

D. 19,78

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 46 to 50.

MENTORING

Many adults in America and increasing numbers elsewhere take part in mentoring schemes. A mentor is an adult who provides support and friendship to a young person. There are numerous different (46)_____ of mentoring: passing on skills, sharing experiences, offering guidance. Sometimes the most helpful thing to do is just listen. Mentoring is open to anybody - no particular (47) _____ experience is required, just a desire to make a difference to the life of a young person who needs help. This may seem a difficult thing at first, but many people find they have a real talent for it.

The support of a mentor can play an important part in a child's development and can often make up (48) _____ a lack of guidance in a young person's life. It can also improve young people's attitudes towards society and build up their confidence in dealing with life's challenges. For the mentor, it can be incredibly rewarding to know that they have had a significant influence on a child and helped to give the best possible (49) _____ in life. Indeed, it is not only adults who are capable of taking on this role. There is now an increasing (50) _____ for teenagers to mentor young children, for example by helping them with reading or other school work.   

Điền ô số 48

A. with 

B. for 

C. over 

D. to