---Do you know why Anna hasn’t come to school today? ---I’m not sure. She _______ be ill.
Thanks to the Internet, different kinds of information ________ in a short time.
The teachers often tell their pupils _____ across the road when the traffic light is red.
She is very good at painting. She can paint _______ her teacher.
--- Mr Li, I can’t understand everything in class.--- Don’t worry! I’ll _____ _ the main points at the end.
--- Excuse me. Could you tell me ?--- It will leave at 4:00 p.m.