The following text is for questions 17 to 20. Sani: I telephoned you at 5 yesterday afternoon, but you didn't answer. Where were you? Yulfa: Sorry, I was in my father's workroom when you called. I didn't hear it until it was too late. Sani: What were you working on? Yulfa:I was printing our paper which we will be submitting it to Ms. Diana at 11 today Sani Right. Yulfa: What were you doing when you telephoned? Sani Iwas collecting some materials for our presentation. We will be discussing them at 2 this afternoon, right? Yulfa: Gosh! Didn't I tell you? Sani: No! What is it about? Yulfa: I'm going to be meeting the IT club members at 2 this afternoon. We'll be photographing the school and its surroundings using drones during the first break tomorrow. We'll show the film at the school anniversary next Saturday.17. Why does Yulfa apologize?
A. She didn't reply Sani's calls.
B. She was submitting her work.
C.She was helping her father.
D. Her telephone wasn't ringing at that time.
18. "I was printing our paper which we will be submitting to Ms. Diana at 11 today What does 'it' refer to?
A. A printer
B. Our paper
C.Yulfa's reply
D. Our presentation
19. What actually will Sani be doing at 2 o'clock in the afternoon?
A. Collecting presentation materials
B. Submitting her paper to Ms. Diana
C. Discussing presentation materials with Yulfa
D. Attending a meeting with the IT club members

20.what are Sani and yulfa like?
a.calm
b.wise
c.active
d.humble​