Khi tách nước từ ancol 3-metylbutan-2-ol, sản phẩm chính thu được là:

A. 2-metylbut-3-en.

B. 2-metylbut-2-en

C. 3-metylbut-2-en

D. 3-metylbut-1-en.

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

They live on a busy road. _____________ a lot of noise from traffic.

A. It must be

B. There must be

C. There must have

D. It must have been

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

“If you keep eating so much fat, you’ll gain weight.” said his mother.

A. His mother suggested him gaining weight if he kept eating so much fat.

B. His mother warned him that he would gain weight if he kept eating so much fat.

C. His mother threatened him to gain weight if he kept eating so much fat

D. His mother complained about his gaining weight if he kept eating so much fat.