Where is Lan? _ Perhaps she is working.
A. She may be working.
B. She can be working.
C. She must be working.
D. She will be working.
Đáp án: C
Dịch: Lan đâu rồi? _ Có lẽ cô ấy đang làm việc.
She goes to school late because she lives very far from school.
Etna is an active volcano. The volcano is on the island of Sicily.