Question 14: We must ________ right now or we will be late.

A. leave

B. leaving

C. to leave

D. leaves

Question 15: She is living with her eldest son, ________?

A. does she

B. aren’t she

C. isn’t she

D. do she

Question 16: Smoking is harmful, ________ many people still smoke.

A. but

B. so

C. therefor

D. however