______ online shopping has changed our life, not all of its effects have been positive.

(单选题)Doctor Black comes from either Oxford or Cambridge. I can’t  (单选题)You should do more ______. Don’t always sit at the desk busy (单选题)Many people agree that ______ knowledge of English is a must (单选题)I found ______ very easy to learn English well if you put yo (单选题)The author chose the composition topic probably because ____ (单选题)What did the students do when the author started his class? (单选题)Before he started his class, the author asked the students t (单选题)What can we learn about the author from Paragraph 2? (单选题)The author took the job to teach writing because ______. (单选题)Which of the following is the writer’s intention?