Students should pay attention to ________the teacher in class.

Who left the classroom ______the light _______— I’m sorry. I forgot it

My God! I haven’t prepared the files forthe new project yet!— _______ The boss won’t needit until next Friday

I like playing computer games, _____ I don’thave much time for it.

It is hard for him to stop __________ though he has had a lot of diseases.