Dẫn hỗn hợp khí gồm CO₂, O₂, N₂ và H₂ qua dung dịch NaOH. Khí bị hấp thụ là:

A. CO₂

B. O₂

C. H₂

D. N₂.

=0+0+...+0-18

=-18

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

The exam to (A) become a lawyer is (B) on far the (C) most difficult he (D) has taken.

A. become

B. on

C. most 

D. has

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

There were (A) inconsiderate (B) amounts of money (C) wasted on large (D) building projects.

A. inconsiderate

B. amounts

C. wasted

D. building 

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Tom’s jokes are (A) inappropriate but we have to put up with (B) it just (C) because he’s (D) the boss.

A. inappropriate

B. it

C. because

D. the