He must have sensed that I _____ at him .He suddenly glanced at me and said quietly “Why are you staring at me like that ”

the weekend, because I ________ get up early on Saturdays and Sundays.

It _____ to chat online all day long.You’d better do something else.

Do you think it’s a good idea to make friends with your students? —- _____ , I doI think it’s a great idea

This is not ______ watch. I think it’s ______.— Oh, I see. Thank you.