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.

For most of their (A) history, especially (B) since the 1860’s (C), New York City has been undergoing (D) major population changes. 

A. their

B. especially

C. the 1860’s

D. has been undergoing 

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.
Mrs. Gibson expressed her thanks for all the help she’d received.

A. Mrs. Gibson stated that she was happy for all the help she’d received.

B. Mrs. Gibson expressed she was surprised at all the help she’d received.

C. Mrs. Gibson reported she was amused at all the help she’d received.

D. Mrs. Gibson said that she was grateful for all the help she’d received.

Nhân tố sinh thái nào sau đây là nhân tố vô sinh?

A. Ánh sáng.

B. Con người.

C. Cạnh tranh cùng loài.

D. Cạnh tranh khác loài.